-/**\r
- * @file\r
- * Dynamic Host Configuration Protocol client\r
- *\r
- */\r
-\r
-/*\r
- *\r
- * Copyright (c) 2001-2004 Leon Woestenberg <leon.woestenberg@gmx.net>\r
- * Copyright (c) 2001-2004 Axon Digital Design B.V., The Netherlands.\r
- * All rights reserved.\r
- *\r
- * Redistribution and use in source and binary forms, with or without modification,\r
- * are permitted provided that the following conditions are met:\r
- *\r
- * 1. Redistributions of source code must retain the above copyright notice,\r
- * this list of conditions and the following disclaimer.\r
- * 2. Redistributions in binary form must reproduce the above copyright notice,\r
- * this list of conditions and the following disclaimer in the documentation\r
- * and/or other materials provided with the distribution.\r
- * 3. The name of the author may not be used to endorse or promote products\r
- * derived from this software without specific prior written permission.\r
- *\r
- * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED\r
- * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF\r
- * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT\r
- * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,\r
- * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT\r
- * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS\r
- * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN\r
- * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING\r
- * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY\r
- * OF SUCH DAMAGE.\r
- *\r
- * This file is a contribution to the lwIP TCP/IP stack.\r
- * The Swedish Institute of Computer Science and Adam Dunkels\r
- * are specifically granted permission to redistribute this\r
- * source code.\r
- *\r
- * Author: Leon Woestenberg <leon.woestenberg@gmx.net>\r
- *\r
- * This is a DHCP client for the lwIP TCP/IP stack. It aims to conform\r
- * with RFC 2131 and RFC 2132.\r
- *\r
- * TODO:\r
- * - Support for interfaces other than Ethernet (SLIP, PPP, ...)\r
- *\r
- * Please coordinate changes and requests with Leon Woestenberg\r
- * <leon.woestenberg@gmx.net>\r
- *\r
- * Integration with your code:\r
- *\r
- * In lwip/dhcp.h\r
- * #define DHCP_COARSE_TIMER_SECS (recommended 60 which is a minute)\r
- * #define DHCP_FINE_TIMER_MSECS (recommended 500 which equals TCP coarse timer)\r
- *\r
- * Then have your application call dhcp_coarse_tmr() and\r
- * dhcp_fine_tmr() on the defined intervals.\r
- *\r
- * dhcp_start(struct netif *netif);\r
- * starts a DHCP client instance which configures the interface by\r
- * obtaining an IP address lease and maintaining it.\r
- *\r
- * Use dhcp_release(netif) to end the lease and use dhcp_stop(netif)\r
- * to remove the DHCP client.\r
- *\r
- */\r
-\r
-#include "lwip/opt.h"\r
-\r
-#if LWIP_DHCP /* don't build if not configured for use in lwipopts.h */\r
-\r
-#include "lwip/stats.h"\r
-#include "lwip/mem.h"\r
-#include "lwip/udp.h"\r
-#include "lwip/ip_addr.h"\r
-#include "lwip/netif.h"\r
-#include "lwip/def.h"\r
-#include "lwip/dhcp.h"\r
-#include "lwip/autoip.h"\r
-#include "lwip/dns.h"\r
-#include "netif/etharp.h"\r
-\r
-#include <string.h>\r
-\r
-/** DHCP_CREATE_RAND_XID: if this is set to 1, the xid is created using\r
- * LWIP_RAND() (this overrides DHCP_GLOBAL_XID)\r
- */\r
-#ifndef DHCP_CREATE_RAND_XID\r
-#define DHCP_CREATE_RAND_XID 1\r
-#endif\r
-\r
-/** Default for DHCP_GLOBAL_XID is 0xABCD0000\r
- * This can be changed by defining DHCP_GLOBAL_XID and DHCP_GLOBAL_XID_HEADER, e.g.\r
- * #define DHCP_GLOBAL_XID_HEADER "stdlib.h"\r
- * #define DHCP_GLOBAL_XID rand()\r
- */\r
-#ifdef DHCP_GLOBAL_XID_HEADER\r
-#include DHCP_GLOBAL_XID_HEADER /* include optional starting XID generation prototypes */\r
-#endif\r
-\r
-/** DHCP_OPTION_MAX_MSG_SIZE is set to the MTU\r
- * MTU is checked to be big enough in dhcp_start */\r
-#define DHCP_MAX_MSG_LEN(netif) (netif->mtu)\r
-#define DHCP_MAX_MSG_LEN_MIN_REQUIRED 576\r
-/** Minimum length for reply before packet is parsed */\r
-#define DHCP_MIN_REPLY_LEN 44\r
-\r
-#define REBOOT_TRIES 2\r
-\r
-/** Option handling: options are parsed in dhcp_parse_reply\r
- * and saved in an array where other functions can load them from.\r
- * This might be moved into the struct dhcp (not necessarily since\r
- * lwIP is single-threaded and the array is only used while in recv\r
- * callback). */\r
-#define DHCP_OPTION_IDX_OVERLOAD 0\r
-#define DHCP_OPTION_IDX_MSG_TYPE 1\r
-#define DHCP_OPTION_IDX_SERVER_ID 2\r
-#define DHCP_OPTION_IDX_LEASE_TIME 3\r
-#define DHCP_OPTION_IDX_T1 4\r
-#define DHCP_OPTION_IDX_T2 5\r
-#define DHCP_OPTION_IDX_SUBNET_MASK 6\r
-#define DHCP_OPTION_IDX_ROUTER 7\r
-#define DHCP_OPTION_IDX_DNS_SERVER 8\r
-#define DHCP_OPTION_IDX_MAX (DHCP_OPTION_IDX_DNS_SERVER + DNS_MAX_SERVERS)\r
-\r
-/** Holds the decoded option values, only valid while in dhcp_recv.\r
- @todo: move this into struct dhcp? */\r
-u32_t dhcp_rx_options_val[DHCP_OPTION_IDX_MAX];\r
-/** Holds a flag which option was received and is contained in dhcp_rx_options_val,\r
- only valid while in dhcp_recv.\r
- @todo: move this into struct dhcp? */\r
-u8_t dhcp_rx_options_given[DHCP_OPTION_IDX_MAX];\r
-\r
-#ifdef DHCP_GLOBAL_XID\r
-static u32_t xid;\r
-static u8_t xid_initialised;\r
-#endif /* DHCP_GLOBAL_XID */\r
-\r
-#define dhcp_option_given(dhcp, idx) (dhcp_rx_options_given[idx] != 0)\r
-#define dhcp_got_option(dhcp, idx) (dhcp_rx_options_given[idx] = 1)\r
-#define dhcp_clear_option(dhcp, idx) (dhcp_rx_options_given[idx] = 0)\r
-#define dhcp_clear_all_options(dhcp) (memset(dhcp_rx_options_given, 0, sizeof(dhcp_rx_options_given)))\r
-#define dhcp_get_option_value(dhcp, idx) (dhcp_rx_options_val[idx])\r
-#define dhcp_set_option_value(dhcp, idx, val) (dhcp_rx_options_val[idx] = (val))\r
-\r
-\r
-/* DHCP client state machine functions */\r
-static err_t dhcp_discover(struct netif *netif);\r
-static err_t dhcp_select(struct netif *netif);\r
-static void dhcp_bind(struct netif *netif);\r
-#if DHCP_DOES_ARP_CHECK\r
-static err_t dhcp_decline(struct netif *netif);\r
-#endif /* DHCP_DOES_ARP_CHECK */\r
-static err_t dhcp_rebind(struct netif *netif);\r
-static err_t dhcp_reboot(struct netif *netif);\r
-static void dhcp_set_state(struct dhcp *dhcp, u8_t new_state);\r
-\r
-/* receive, unfold, parse and free incoming messages */\r
-static void dhcp_recv(void *arg, struct udp_pcb *pcb, struct pbuf *p, ip_addr_t *addr, u16_t port);\r
-\r
-/* set the DHCP timers */\r
-static void dhcp_timeout(struct netif *netif);\r
-static void dhcp_t1_timeout(struct netif *netif);\r
-static void dhcp_t2_timeout(struct netif *netif);\r
-\r
-/* build outgoing messages */\r
-/* create a DHCP message, fill in common headers */\r
-static err_t dhcp_create_msg(struct netif *netif, struct dhcp *dhcp, u8_t message_type);\r
-/* free a DHCP request */\r
-static void dhcp_delete_msg(struct dhcp *dhcp);\r
-/* add a DHCP option (type, then length in bytes) */\r
-static void dhcp_option(struct dhcp *dhcp, u8_t option_type, u8_t option_len);\r
-/* add option values */\r
-static void dhcp_option_byte(struct dhcp *dhcp, u8_t value);\r
-static void dhcp_option_short(struct dhcp *dhcp, u16_t value);\r
-static void dhcp_option_long(struct dhcp *dhcp, u32_t value);\r
-#if LWIP_NETIF_HOSTNAME\r
-static void dhcp_option_hostname(struct dhcp *dhcp, struct netif *netif);\r
-#endif /* LWIP_NETIF_HOSTNAME */\r
-/* always add the DHCP options trailer to end and pad */\r
-static void dhcp_option_trailer(struct dhcp *dhcp);\r
-\r
-/**\r
- * Back-off the DHCP client (because of a received NAK response).\r
- *\r
- * Back-off the DHCP client because of a received NAK. Receiving a\r
- * NAK means the client asked for something non-sensible, for\r
- * example when it tries to renew a lease obtained on another network.\r
- *\r
- * We clear any existing set IP address and restart DHCP negotiation\r
- * afresh (as per RFC2131 3.2.3).\r
- *\r
- * @param netif the netif under DHCP control\r
- */\r
-static void\r
-dhcp_handle_nak(struct netif *netif)\r
-{\r
- struct dhcp *dhcp = netif->dhcp;\r
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_handle_nak(netif=%p) %c%c%"U16_F"\n", \r
- (void*)netif, netif->name[0], netif->name[1], (u16_t)netif->num));\r
- /* Set the interface down since the address must no longer be used, as per RFC2131 */\r
- netif_set_down(netif);\r
- /* remove IP address from interface */\r
- netif_set_ipaddr(netif, IP_ADDR_ANY);\r
- netif_set_gw(netif, IP_ADDR_ANY);\r
- netif_set_netmask(netif, IP_ADDR_ANY); \r
- /* Change to a defined state */\r
- dhcp_set_state(dhcp, DHCP_BACKING_OFF);\r
- /* We can immediately restart discovery */\r
- dhcp_discover(netif);\r
-}\r
-\r
-#if DHCP_DOES_ARP_CHECK\r
-/**\r
- * Checks if the offered IP address is already in use.\r
- *\r
- * It does so by sending an ARP request for the offered address and\r
- * entering CHECKING state. If no ARP reply is received within a small\r
- * interval, the address is assumed to be free for use by us.\r
- *\r
- * @param netif the netif under DHCP control\r
- */\r
-static void\r
-dhcp_check(struct netif *netif)\r
-{\r
- struct dhcp *dhcp = netif->dhcp;\r
- err_t result;\r
- u16_t msecs;\r
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_check(netif=%p) %c%c\n", (void *)netif, (s16_t)netif->name[0],\r
- (s16_t)netif->name[1]));\r
- dhcp_set_state(dhcp, DHCP_CHECKING);\r
- /* create an ARP query for the offered IP address, expecting that no host\r
- responds, as the IP address should not be in use. */\r
- result = etharp_query(netif, &dhcp->offered_ip_addr, NULL);\r
- if (result != ERR_OK) {\r
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_WARNING, ("dhcp_check: could not perform ARP query\n"));\r
- }\r
- dhcp->tries++;\r
- msecs = 500;\r
- dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;\r
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_check(): set request timeout %"U16_F" msecs\n", msecs));\r
-}\r
-#endif /* DHCP_DOES_ARP_CHECK */\r
-\r
-/**\r
- * Remember the configuration offered by a DHCP server.\r
- *\r
- * @param netif the netif under DHCP control\r
- */\r
-static void\r
-dhcp_handle_offer(struct netif *netif)\r
-{\r
- struct dhcp *dhcp = netif->dhcp;\r
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_handle_offer(netif=%p) %c%c%"U16_F"\n",\r
- (void*)netif, netif->name[0], netif->name[1], (u16_t)netif->num));\r
- /* obtain the server address */\r
- if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_SERVER_ID)) {\r
- ip4_addr_set_u32(&dhcp->server_ip_addr, htonl(dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_SERVER_ID)));\r
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_STATE, ("dhcp_handle_offer(): server 0x%08"X32_F"\n",\r
- ip4_addr_get_u32(&dhcp->server_ip_addr)));\r
- /* remember offered address */\r
- ip_addr_copy(dhcp->offered_ip_addr, dhcp->msg_in->yiaddr);\r
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_STATE, ("dhcp_handle_offer(): offer for 0x%08"X32_F"\n",\r
- ip4_addr_get_u32(&dhcp->offered_ip_addr)));\r
-\r
- dhcp_select(netif);\r
- } else {\r
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS,\r
- ("dhcp_handle_offer(netif=%p) did not get server ID!\n", (void*)netif));\r
- }\r
-}\r
-\r
-/**\r
- * Select a DHCP server offer out of all offers.\r
- *\r
- * Simply select the first offer received.\r
- *\r
- * @param netif the netif under DHCP control\r
- * @return lwIP specific error (see error.h)\r
- */\r
-static err_t\r
-dhcp_select(struct netif *netif)\r
-{\r
- struct dhcp *dhcp = netif->dhcp;\r
- err_t result;\r
- u16_t msecs;\r
-\r
- 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));\r
- dhcp_set_state(dhcp, DHCP_REQUESTING);\r
-\r
- /* create and initialize the DHCP message header */\r
- result = dhcp_create_msg(netif, dhcp, DHCP_REQUEST);\r
- if (result == ERR_OK) {\r
- dhcp_option(dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);\r
- dhcp_option_short(dhcp, DHCP_MAX_MSG_LEN(netif));\r
-\r
- /* MUST request the offered IP address */\r
- dhcp_option(dhcp, DHCP_OPTION_REQUESTED_IP, 4);\r
- dhcp_option_long(dhcp, ntohl(ip4_addr_get_u32(&dhcp->offered_ip_addr)));\r
-\r
- dhcp_option(dhcp, DHCP_OPTION_SERVER_ID, 4);\r
- dhcp_option_long(dhcp, ntohl(ip4_addr_get_u32(&dhcp->server_ip_addr)));\r
-\r
- dhcp_option(dhcp, DHCP_OPTION_PARAMETER_REQUEST_LIST, 4/*num options*/);\r
- dhcp_option_byte(dhcp, DHCP_OPTION_SUBNET_MASK);\r
- dhcp_option_byte(dhcp, DHCP_OPTION_ROUTER);\r
- dhcp_option_byte(dhcp, DHCP_OPTION_BROADCAST);\r
- dhcp_option_byte(dhcp, DHCP_OPTION_DNS_SERVER);\r
-\r
-#if LWIP_NETIF_HOSTNAME\r
- dhcp_option_hostname(dhcp, netif);\r
-#endif /* LWIP_NETIF_HOSTNAME */\r
-\r
- dhcp_option_trailer(dhcp);\r
- /* shrink the pbuf to the actual content length */\r
- pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);\r
-\r
- /* send broadcast to any DHCP server */\r
- udp_sendto_if(dhcp->pcb, dhcp->p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);\r
- dhcp_delete_msg(dhcp);\r
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_select: REQUESTING\n"));\r
- } else {\r
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_WARNING, ("dhcp_select: could not allocate DHCP request\n"));\r
- }\r
- dhcp->tries++;\r
- msecs = (dhcp->tries < 6 ? 1 << dhcp->tries : 60) * 1000;\r
- dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;\r
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_STATE, ("dhcp_select(): set request timeout %"U16_F" msecs\n", msecs));\r
- return result;\r
-}\r
-\r
-/**\r
- * The DHCP timer that checks for lease renewal/rebind timeouts.\r
- */\r
-void\r
-dhcp_coarse_tmr()\r
-{\r
- struct netif *netif = netif_list;\r
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_coarse_tmr()\n"));\r
- /* iterate through all network interfaces */\r
- while (netif != NULL) {\r
- /* only act on DHCP configured interfaces */\r
- if (netif->dhcp != NULL) {\r
- /* timer is active (non zero), and triggers (zeroes) now? */\r
- if (netif->dhcp->t2_timeout-- == 1) {\r
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_coarse_tmr(): t2 timeout\n"));\r
- /* this clients' rebind timeout triggered */\r
- dhcp_t2_timeout(netif);\r
- /* timer is active (non zero), and triggers (zeroes) now */\r
- } else if (netif->dhcp->t1_timeout-- == 1) {\r
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_coarse_tmr(): t1 timeout\n"));\r
- /* this clients' renewal timeout triggered */\r
- dhcp_t1_timeout(netif);\r
- }\r
- }\r
- /* proceed to next netif */\r
- netif = netif->next;\r
- }\r
-}\r
-\r
-/**\r
- * DHCP transaction timeout handling\r
- *\r
- * A DHCP server is expected to respond within a short period of time.\r
- * This timer checks whether an outstanding DHCP request is timed out.\r
- */\r
-void\r
-dhcp_fine_tmr()\r
-{\r
- struct netif *netif = netif_list;\r
- /* loop through netif's */\r
- while (netif != NULL) {\r
- /* only act on DHCP configured interfaces */\r
- if (netif->dhcp != NULL) {\r
- /* timer is active (non zero), and is about to trigger now */ \r
- if (netif->dhcp->request_timeout > 1) {\r
- netif->dhcp->request_timeout--;\r
- }\r
- else if (netif->dhcp->request_timeout == 1) {\r
- netif->dhcp->request_timeout--;\r
- /* { netif->dhcp->request_timeout == 0 } */\r
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_fine_tmr(): request timeout\n"));\r
- /* this client's request timeout triggered */\r
- dhcp_timeout(netif);\r
- }\r
- }\r
- /* proceed to next network interface */\r
- netif = netif->next;\r
- }\r
-}\r
-\r
-/**\r
- * A DHCP negotiation transaction, or ARP request, has timed out.\r
- *\r
- * The timer that was started with the DHCP or ARP request has\r
- * timed out, indicating no response was received in time.\r
- *\r
- * @param netif the netif under DHCP control\r
- */\r
-static void\r
-dhcp_timeout(struct netif *netif)\r
-{\r
- struct dhcp *dhcp = netif->dhcp;\r
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_timeout()\n"));\r
- /* back-off period has passed, or server selection timed out */\r
- if ((dhcp->state == DHCP_BACKING_OFF) || (dhcp->state == DHCP_SELECTING)) {\r
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_timeout(): restarting discovery\n"));\r
- dhcp_discover(netif);\r
- /* receiving the requested lease timed out */\r
- } else if (dhcp->state == DHCP_REQUESTING) {\r
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_timeout(): REQUESTING, DHCP request timed out\n"));\r
- if (dhcp->tries <= 5) {\r
- dhcp_select(netif);\r
- } else {\r
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_timeout(): REQUESTING, releasing, restarting\n"));\r
- dhcp_release(netif);\r
- dhcp_discover(netif);\r
- }\r
-#if DHCP_DOES_ARP_CHECK\r
- /* received no ARP reply for the offered address (which is good) */\r
- } else if (dhcp->state == DHCP_CHECKING) {\r
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_timeout(): CHECKING, ARP request timed out\n"));\r
- if (dhcp->tries <= 1) {\r
- dhcp_check(netif);\r
- /* no ARP replies on the offered address,\r
- looks like the IP address is indeed free */\r
- } else {\r
- /* bind the interface to the offered address */\r
- dhcp_bind(netif);\r
- }\r
-#endif /* DHCP_DOES_ARP_CHECK */\r
- }\r
- /* did not get response to renew request? */\r
- else if (dhcp->state == DHCP_RENEWING) {\r
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_timeout(): RENEWING, DHCP request timed out\n"));\r
- /* just retry renewal */\r
- /* note that the rebind timer will eventually time-out if renew does not work */\r
- dhcp_renew(netif);\r
- /* did not get response to rebind request? */\r
- } else if (dhcp->state == DHCP_REBINDING) {\r
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_timeout(): REBINDING, DHCP request timed out\n"));\r
- if (dhcp->tries <= 8) {\r
- dhcp_rebind(netif);\r
- } else {\r
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_timeout(): RELEASING, DISCOVERING\n"));\r
- dhcp_release(netif);\r
- dhcp_discover(netif);\r
- }\r
- } else if (dhcp->state == DHCP_REBOOTING) {\r
- if (dhcp->tries < REBOOT_TRIES) {\r
- dhcp_reboot(netif);\r
- } else {\r
- dhcp_discover(netif);\r
- }\r
- }\r
-}\r
-\r
-/**\r
- * The renewal period has timed out.\r
- *\r
- * @param netif the netif under DHCP control\r
- */\r
-static void\r
-dhcp_t1_timeout(struct netif *netif)\r
-{\r
- struct dhcp *dhcp = netif->dhcp;\r
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_STATE, ("dhcp_t1_timeout()\n"));\r
- if ((dhcp->state == DHCP_REQUESTING) || (dhcp->state == DHCP_BOUND) ||\r
- (dhcp->state == DHCP_RENEWING)) {\r
- /* just retry to renew - note that the rebind timer (t2) will\r
- * eventually time-out if renew tries fail. */\r
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE,\r
- ("dhcp_t1_timeout(): must renew\n"));\r
- /* This slightly different to RFC2131: DHCPREQUEST will be sent from state\r
- DHCP_RENEWING, not DHCP_BOUND */\r
- dhcp_renew(netif);\r
- }\r
-}\r
-\r
-/**\r
- * The rebind period has timed out.\r
- *\r
- * @param netif the netif under DHCP control\r
- */\r
-static void\r
-dhcp_t2_timeout(struct netif *netif)\r
-{\r
- struct dhcp *dhcp = netif->dhcp;\r
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_t2_timeout()\n"));\r
- if ((dhcp->state == DHCP_REQUESTING) || (dhcp->state == DHCP_BOUND) ||\r
- (dhcp->state == DHCP_RENEWING)) {\r
- /* just retry to rebind */\r
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE,\r
- ("dhcp_t2_timeout(): must rebind\n"));\r
- /* This slightly different to RFC2131: DHCPREQUEST will be sent from state\r
- DHCP_REBINDING, not DHCP_BOUND */\r
- dhcp_rebind(netif);\r
- }\r
-}\r
-\r
-/**\r
- * Handle a DHCP ACK packet\r
- *\r
- * @param netif the netif under DHCP control\r
- */\r
-static void\r
-dhcp_handle_ack(struct netif *netif)\r
-{\r
- struct dhcp *dhcp = netif->dhcp;\r
-#if LWIP_DNS\r
- u8_t n;\r
-#endif /* LWIP_DNS */\r
-\r
- /* clear options we might not get from the ACK */\r
- ip_addr_set_zero(&dhcp->offered_sn_mask);\r
- ip_addr_set_zero(&dhcp->offered_gw_addr);\r
-#if LWIP_DHCP_BOOTP_FILE\r
- ip_addr_set_zero(&dhcp->offered_si_addr);\r
-#endif /* LWIP_DHCP_BOOTP_FILE */\r
-\r
- /* lease time given? */\r
- if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_LEASE_TIME)) {\r
- /* remember offered lease time */\r
- dhcp->offered_t0_lease = dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_LEASE_TIME);\r
- }\r
- /* renewal period given? */\r
- if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_T1)) {\r
- /* remember given renewal period */\r
- dhcp->offered_t1_renew = dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_T1);\r
- } else {\r
- /* calculate safe periods for renewal */\r
- dhcp->offered_t1_renew = dhcp->offered_t0_lease / 2;\r
- }\r
-\r
- /* renewal period given? */\r
- if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_T2)) {\r
- /* remember given rebind period */\r
- dhcp->offered_t2_rebind = dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_T2);\r
- } else {\r
- /* calculate safe periods for rebinding */\r
- dhcp->offered_t2_rebind = dhcp->offered_t0_lease;\r
- }\r
-\r
- /* (y)our internet address */\r
- ip_addr_copy(dhcp->offered_ip_addr, dhcp->msg_in->yiaddr);\r
-\r
-#if LWIP_DHCP_BOOTP_FILE\r
- /* copy boot server address,\r
- boot file name copied in dhcp_parse_reply if not overloaded */\r
- ip_addr_copy(dhcp->offered_si_addr, dhcp->msg_in->siaddr);\r
-#endif /* LWIP_DHCP_BOOTP_FILE */\r
-\r
- /* subnet mask given? */\r
- if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_SUBNET_MASK)) {\r
- /* remember given subnet mask */\r
- ip4_addr_set_u32(&dhcp->offered_sn_mask, htonl(dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_SUBNET_MASK)));\r
- dhcp->subnet_mask_given = 1;\r
- } else {\r
- dhcp->subnet_mask_given = 0;\r
- }\r
-\r
- /* gateway router */\r
- if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_ROUTER)) {\r
- ip4_addr_set_u32(&dhcp->offered_gw_addr, htonl(dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_ROUTER)));\r
- }\r
- \r
-#if LWIP_DNS\r
- /* DNS servers */\r
- for(n = 0; (n < DNS_MAX_SERVERS) && dhcp_option_given(dhcp, DHCP_OPTION_IDX_DNS_SERVER + n); n++) {\r
- ip_addr_t dns_addr;\r
- ip4_addr_set_u32(&dns_addr, htonl(dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_DNS_SERVER + n)));\r
- dns_setserver(n, &dns_addr);\r
- }\r
-#endif /* LWIP_DNS */\r
-}\r
-\r
-/** Set a statically allocated struct dhcp to work with.\r
- * Using this prevents dhcp_start to allocate it using mem_malloc.\r
- *\r
- * @param netif the netif for which to set the struct dhcp\r
- * @param dhcp (uninitialised) dhcp struct allocated by the application\r
- */\r
-void\r
-dhcp_set_struct(struct netif *netif, struct dhcp *dhcp)\r
-{\r
- LWIP_ASSERT("netif != NULL", netif != NULL);\r
- LWIP_ASSERT("dhcp != NULL", dhcp != NULL);\r
- LWIP_ASSERT("netif already has a struct dhcp set", netif->dhcp == NULL);\r
-\r
- /* clear data structure */\r
- memset(dhcp, 0, sizeof(struct dhcp));\r
- /* dhcp_set_state(&dhcp, DHCP_OFF); */\r
- netif->dhcp = dhcp;\r
-}\r
-\r
-/** Removes a struct dhcp from a netif.\r
- *\r
- * ATTENTION: Only use this when not using dhcp_set_struct() to allocate the\r
- * struct dhcp since the memory is passed back to the heap.\r
- *\r
- * @param netif the netif from which to remove the struct dhcp\r
- */\r
-void dhcp_cleanup(struct netif *netif)\r
-{\r
- LWIP_ASSERT("netif != NULL", netif != NULL);\r
-\r
- if (netif->dhcp != NULL) {\r
- mem_free(netif->dhcp);\r
- netif->dhcp = NULL;\r
- }\r
-}\r
-\r
-/**\r
- * Start DHCP negotiation for a network interface.\r
- *\r
- * If no DHCP client instance was attached to this interface,\r
- * a new client is created first. If a DHCP client instance\r
- * was already present, it restarts negotiation.\r
- *\r
- * @param netif The lwIP network interface\r
- * @return lwIP error code\r
- * - ERR_OK - No error\r
- * - ERR_MEM - Out of memory\r
- */\r
-err_t\r
-dhcp_start(struct netif *netif)\r
-{\r
- struct dhcp *dhcp;\r
- err_t result = ERR_OK;\r
-\r
- LWIP_ERROR("netif != NULL", (netif != NULL), return ERR_ARG;);\r
- dhcp = netif->dhcp;\r
- 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));\r
- /* Remove the flag that says this netif is handled by DHCP,\r
- it is set when we succeeded starting. */\r
- netif->flags &= ~NETIF_FLAG_DHCP;\r
-\r
- /* check hwtype of the netif */\r
- if ((netif->flags & NETIF_FLAG_ETHARP) == 0) {\r
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_start(): No ETHARP netif\n"));\r
- return ERR_ARG;\r
- }\r
-\r
- /* check MTU of the netif */\r
- if (netif->mtu < DHCP_MAX_MSG_LEN_MIN_REQUIRED) {\r
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_start(): Cannot use this netif with DHCP: MTU is too small\n"));\r
- return ERR_MEM;\r
- }\r
-\r
- /* no DHCP client attached yet? */\r
- if (dhcp == NULL) {\r
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_start(): starting new DHCP client\n"));\r
- dhcp = (struct dhcp *)mem_malloc(sizeof(struct dhcp));\r
- if (dhcp == NULL) {\r
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_start(): could not allocate dhcp\n"));\r
- return ERR_MEM;\r
- }\r
- /* store this dhcp client in the netif */\r
- netif->dhcp = dhcp;\r
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_start(): allocated dhcp"));\r
- /* already has DHCP client attached */\r
- } else {\r
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_start(): restarting DHCP configuration\n"));\r
- if (dhcp->pcb != NULL) {\r
- udp_remove(dhcp->pcb);\r
- }\r
- LWIP_ASSERT("pbuf p_out wasn't freed", dhcp->p_out == NULL);\r
- LWIP_ASSERT("reply wasn't freed", dhcp->msg_in == NULL );\r
- }\r
- \r
- /* clear data structure */\r
- memset(dhcp, 0, sizeof(struct dhcp));\r
- /* dhcp_set_state(&dhcp, DHCP_OFF); */\r
- /* allocate UDP PCB */\r
- dhcp->pcb = udp_new();\r
- if (dhcp->pcb == NULL) {\r
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_start(): could not obtain pcb\n"));\r
- return ERR_MEM;\r
- }\r
- ip_set_option(dhcp->pcb, SOF_BROADCAST);\r
- /* set up local and remote port for the pcb */\r
- udp_bind(dhcp->pcb, IP_ADDR_ANY, DHCP_CLIENT_PORT);\r
- udp_connect(dhcp->pcb, IP_ADDR_ANY, DHCP_SERVER_PORT);\r
- /* set up the recv callback and argument */\r
- udp_recv(dhcp->pcb, dhcp_recv, netif);\r
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_start(): starting DHCP configuration\n"));\r
- /* (re)start the DHCP negotiation */\r
- result = dhcp_discover(netif);\r
- if (result != ERR_OK) {\r
- /* free resources allocated above */\r
- dhcp_stop(netif);\r
- return ERR_MEM;\r
- }\r
- /* Set the flag that says this netif is handled by DHCP. */\r
- netif->flags |= NETIF_FLAG_DHCP;\r
- return result;\r
-}\r
-\r
-/**\r
- * Inform a DHCP server of our manual configuration.\r
- *\r
- * This informs DHCP servers of our fixed IP address configuration\r
- * by sending an INFORM message. It does not involve DHCP address\r
- * configuration, it is just here to be nice to the network.\r
- *\r
- * @param netif The lwIP network interface\r
- */\r
-void\r
-dhcp_inform(struct netif *netif)\r
-{\r
- struct dhcp dhcp;\r
- err_t result = ERR_OK;\r
- struct udp_pcb *pcb;\r
-\r
- LWIP_ERROR("netif != NULL", (netif != NULL), return;);\r
-\r
- memset(&dhcp, 0, sizeof(struct dhcp));\r
- dhcp_set_state(&dhcp, DHCP_INFORM);\r
-\r
- if ((netif->dhcp != NULL) && (netif->dhcp->pcb != NULL)) {\r
- /* re-use existing pcb */\r
- pcb = netif->dhcp->pcb;\r
- } else {\r
- pcb = udp_new();\r
- if (pcb == NULL) {\r
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("dhcp_inform(): could not obtain pcb"));\r
- return;\r
- }\r
- dhcp.pcb = pcb;\r
- ip_set_option(dhcp.pcb, SOF_BROADCAST);\r
- udp_bind(dhcp.pcb, IP_ADDR_ANY, DHCP_CLIENT_PORT);\r
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_inform(): created new udp pcb\n"));\r
- }\r
- /* create and initialize the DHCP message header */\r
- result = dhcp_create_msg(netif, &dhcp, DHCP_INFORM);\r
- if (result == ERR_OK) {\r
- dhcp_option(&dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);\r
- dhcp_option_short(&dhcp, DHCP_MAX_MSG_LEN(netif));\r
-\r
- dhcp_option_trailer(&dhcp);\r
-\r
- pbuf_realloc(dhcp.p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp.options_out_len);\r
-\r
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_inform: INFORMING\n"));\r
- udp_sendto_if(pcb, dhcp.p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);\r
- dhcp_delete_msg(&dhcp);\r
- } else {\r
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("dhcp_inform: could not allocate DHCP request\n"));\r
- }\r
-\r
- if (dhcp.pcb != NULL) {\r
- /* otherwise, the existing pcb was used */\r
- udp_remove(dhcp.pcb);\r
- }\r
-}\r
-\r
-/** Handle a possible change in the network configuration.\r
- *\r
- * This enters the REBOOTING state to verify that the currently bound\r
- * address is still valid.\r
- */\r
-void\r
-dhcp_network_changed(struct netif *netif)\r
-{\r
- struct dhcp *dhcp = netif->dhcp;\r
- if (!dhcp)\r
- return;\r
- switch (dhcp->state) {\r
- case DHCP_REBINDING:\r
- case DHCP_RENEWING:\r
- case DHCP_BOUND:\r
- case DHCP_REBOOTING:\r
- netif_set_down(netif);\r
- dhcp->tries = 0;\r
- dhcp_reboot(netif);\r
- break;\r
- case DHCP_OFF:\r
- /* stay off */\r
- break;\r
- default:\r
- dhcp->tries = 0;\r
-#if LWIP_DHCP_AUTOIP_COOP\r
- if(dhcp->autoip_coop_state == DHCP_AUTOIP_COOP_STATE_ON) {\r
- autoip_stop(netif);\r
- dhcp->autoip_coop_state = DHCP_AUTOIP_COOP_STATE_OFF;\r
- }\r
-#endif /* LWIP_DHCP_AUTOIP_COOP */\r
- dhcp_discover(netif);\r
- break;\r
- }\r
-}\r
-\r
-#if DHCP_DOES_ARP_CHECK\r
-/**\r
- * Match an ARP reply with the offered IP address.\r
- *\r
- * @param netif the network interface on which the reply was received\r
- * @param addr The IP address we received a reply from\r
- */\r
-void dhcp_arp_reply(struct netif *netif, ip_addr_t *addr)\r
-{\r
- LWIP_ERROR("netif != NULL", (netif != NULL), return;);\r
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_arp_reply()\n"));\r
- /* is a DHCP client doing an ARP check? */\r
- if ((netif->dhcp != NULL) && (netif->dhcp->state == DHCP_CHECKING)) {\r
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_arp_reply(): CHECKING, arp reply for 0x%08"X32_F"\n",\r
- ip4_addr_get_u32(addr)));\r
- /* did a host respond with the address we\r
- were offered by the DHCP server? */\r
- if (ip_addr_cmp(addr, &netif->dhcp->offered_ip_addr)) {\r
- /* we will not accept the offered address */\r
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE | LWIP_DBG_LEVEL_WARNING,\r
- ("dhcp_arp_reply(): arp reply matched with offered address, declining\n"));\r
- dhcp_decline(netif);\r
- }\r
- }\r
-}\r
-\r
-/**\r
- * Decline an offered lease.\r
- *\r
- * Tell the DHCP server we do not accept the offered address.\r
- * One reason to decline the lease is when we find out the address\r
- * is already in use by another host (through ARP).\r
- *\r
- * @param netif the netif under DHCP control\r
- */\r
-static err_t\r
-dhcp_decline(struct netif *netif)\r
-{\r
- struct dhcp *dhcp = netif->dhcp;\r
- err_t result = ERR_OK;\r
- u16_t msecs;\r
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_decline()\n"));\r
- dhcp_set_state(dhcp, DHCP_BACKING_OFF);\r
- /* create and initialize the DHCP message header */\r
- result = dhcp_create_msg(netif, dhcp, DHCP_DECLINE);\r
- if (result == ERR_OK) {\r
- dhcp_option(dhcp, DHCP_OPTION_REQUESTED_IP, 4);\r
- dhcp_option_long(dhcp, ntohl(ip4_addr_get_u32(&dhcp->offered_ip_addr)));\r
-\r
- dhcp_option_trailer(dhcp);\r
- /* resize pbuf to reflect true size of options */\r
- pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);\r
-\r
- /* per section 4.4.4, broadcast DECLINE messages */\r
- udp_sendto_if(dhcp->pcb, dhcp->p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);\r
- dhcp_delete_msg(dhcp);\r
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_decline: BACKING OFF\n"));\r
- } else {\r
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS,\r
- ("dhcp_decline: could not allocate DHCP request\n"));\r
- }\r
- dhcp->tries++;\r
- msecs = 10*1000;\r
- dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;\r
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_decline(): set request timeout %"U16_F" msecs\n", msecs));\r
- return result;\r
-}\r
-#endif /* DHCP_DOES_ARP_CHECK */\r
-\r
-\r
-/**\r
- * Start the DHCP process, discover a DHCP server.\r
- *\r
- * @param netif the netif under DHCP control\r
- */\r
-static err_t\r
-dhcp_discover(struct netif *netif)\r
-{\r
- struct dhcp *dhcp = netif->dhcp;\r
- err_t result = ERR_OK;\r
- u16_t msecs;\r
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_discover()\n"));\r
- ip_addr_set_any(&dhcp->offered_ip_addr);\r
- dhcp_set_state(dhcp, DHCP_SELECTING);\r
- /* create and initialize the DHCP message header */\r
- result = dhcp_create_msg(netif, dhcp, DHCP_DISCOVER);\r
- if (result == ERR_OK) {\r
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_discover: making request\n"));\r
-\r
- dhcp_option(dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);\r
- dhcp_option_short(dhcp, DHCP_MAX_MSG_LEN(netif));\r
-\r
- dhcp_option(dhcp, DHCP_OPTION_PARAMETER_REQUEST_LIST, 4/*num options*/);\r
- dhcp_option_byte(dhcp, DHCP_OPTION_SUBNET_MASK);\r
- dhcp_option_byte(dhcp, DHCP_OPTION_ROUTER);\r
- dhcp_option_byte(dhcp, DHCP_OPTION_BROADCAST);\r
- dhcp_option_byte(dhcp, DHCP_OPTION_DNS_SERVER);\r
-\r
- dhcp_option_trailer(dhcp);\r
-\r
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_discover: realloc()ing\n"));\r
- pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);\r
-\r
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_discover: sendto(DISCOVER, IP_ADDR_BROADCAST, DHCP_SERVER_PORT)\n"));\r
- udp_sendto_if(dhcp->pcb, dhcp->p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);\r
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_discover: deleting()ing\n"));\r
- dhcp_delete_msg(dhcp);\r
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_discover: SELECTING\n"));\r
- } else {\r
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("dhcp_discover: could not allocate DHCP request\n"));\r
- }\r
- dhcp->tries++;\r
-#if LWIP_DHCP_AUTOIP_COOP\r
- if(dhcp->tries >= LWIP_DHCP_AUTOIP_COOP_TRIES && dhcp->autoip_coop_state == DHCP_AUTOIP_COOP_STATE_OFF) {\r
- dhcp->autoip_coop_state = DHCP_AUTOIP_COOP_STATE_ON;\r
- autoip_start(netif);\r
- }\r
-#endif /* LWIP_DHCP_AUTOIP_COOP */\r
- msecs = (dhcp->tries < 6 ? 1 << dhcp->tries : 60) * 1000;\r
- dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;\r
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_discover(): set request timeout %"U16_F" msecs\n", msecs));\r
- return result;\r
-}\r
-\r
-\r
-/**\r
- * Bind the interface to the offered IP address.\r
- *\r
- * @param netif network interface to bind to the offered address\r
- */\r
-static void\r
-dhcp_bind(struct netif *netif)\r
-{\r
- u32_t timeout;\r
- struct dhcp *dhcp;\r
- ip_addr_t sn_mask, gw_addr;\r
- LWIP_ERROR("dhcp_bind: netif != NULL", (netif != NULL), return;);\r
- dhcp = netif->dhcp;\r
- LWIP_ERROR("dhcp_bind: dhcp != NULL", (dhcp != NULL), return;);\r
- 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));\r
-\r
- /* temporary DHCP lease? */\r
- if (dhcp->offered_t1_renew != 0xffffffffUL) {\r
- /* set renewal period timer */\r
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_bind(): t1 renewal timer %"U32_F" secs\n", dhcp->offered_t1_renew));\r
- timeout = (dhcp->offered_t1_renew + DHCP_COARSE_TIMER_SECS / 2) / DHCP_COARSE_TIMER_SECS;\r
- if(timeout > 0xffff) {\r
- timeout = 0xffff;\r
- }\r
- dhcp->t1_timeout = (u16_t)timeout;\r
- if (dhcp->t1_timeout == 0) {\r
- dhcp->t1_timeout = 1;\r
- }\r
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_bind(): set request timeout %"U32_F" msecs\n", dhcp->offered_t1_renew*1000));\r
- }\r
- /* set renewal period timer */\r
- if (dhcp->offered_t2_rebind != 0xffffffffUL) {\r
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_bind(): t2 rebind timer %"U32_F" secs\n", dhcp->offered_t2_rebind));\r
- timeout = (dhcp->offered_t2_rebind + DHCP_COARSE_TIMER_SECS / 2) / DHCP_COARSE_TIMER_SECS;\r
- if(timeout > 0xffff) {\r
- timeout = 0xffff;\r
- }\r
- dhcp->t2_timeout = (u16_t)timeout;\r
- if (dhcp->t2_timeout == 0) {\r
- dhcp->t2_timeout = 1;\r
- }\r
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_bind(): set request timeout %"U32_F" msecs\n", dhcp->offered_t2_rebind*1000));\r
- }\r
-\r
- /* If we have sub 1 minute lease, t2 and t1 will kick in at the same time. */\r
- if ((dhcp->t1_timeout >= dhcp->t2_timeout) && (dhcp->t2_timeout > 0)) {\r
- dhcp->t1_timeout = 0;\r
- }\r
-\r
- if (dhcp->subnet_mask_given) {\r
- /* copy offered network mask */\r
- ip_addr_copy(sn_mask, dhcp->offered_sn_mask);\r
- } else {\r
- /* subnet mask not given, choose a safe subnet mask given the network class */\r
- u8_t first_octet = ip4_addr1(&dhcp->offered_ip_addr);\r
- if (first_octet <= 127) {\r
- ip4_addr_set_u32(&sn_mask, PP_HTONL(0xff000000UL));\r
- } else if (first_octet >= 192) {\r
- ip4_addr_set_u32(&sn_mask, PP_HTONL(0xffffff00UL));\r
- } else {\r
- ip4_addr_set_u32(&sn_mask, PP_HTONL(0xffff0000UL));\r
- }\r
- }\r
-\r
- ip_addr_copy(gw_addr, dhcp->offered_gw_addr);\r
- /* gateway address not given? */\r
- if (ip_addr_isany(&gw_addr)) {\r
- /* copy network address */\r
- ip_addr_get_network(&gw_addr, &dhcp->offered_ip_addr, &sn_mask);\r
- /* use first host address on network as gateway */\r
- ip4_addr_set_u32(&gw_addr, ip4_addr_get_u32(&gw_addr) | PP_HTONL(0x00000001UL));\r
- }\r
-\r
-#if LWIP_DHCP_AUTOIP_COOP\r
- if(dhcp->autoip_coop_state == DHCP_AUTOIP_COOP_STATE_ON) {\r
- autoip_stop(netif);\r
- dhcp->autoip_coop_state = DHCP_AUTOIP_COOP_STATE_OFF;\r
- }\r
-#endif /* LWIP_DHCP_AUTOIP_COOP */\r
-\r
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_STATE, ("dhcp_bind(): IP: 0x%08"X32_F"\n",\r
- ip4_addr_get_u32(&dhcp->offered_ip_addr)));\r
- netif_set_ipaddr(netif, &dhcp->offered_ip_addr);\r
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_STATE, ("dhcp_bind(): SN: 0x%08"X32_F"\n",\r
- ip4_addr_get_u32(&sn_mask)));\r
- netif_set_netmask(netif, &sn_mask);\r
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_STATE, ("dhcp_bind(): GW: 0x%08"X32_F"\n",\r
- ip4_addr_get_u32(&gw_addr)));\r
- netif_set_gw(netif, &gw_addr);\r
- /* bring the interface up */\r
- netif_set_up(netif);\r
- /* netif is now bound to DHCP leased address */\r
- dhcp_set_state(dhcp, DHCP_BOUND);\r
-}\r
-\r
-/**\r
- * Renew an existing DHCP lease at the involved DHCP server.\r
- *\r
- * @param netif network interface which must renew its lease\r
- */\r
-err_t\r
-dhcp_renew(struct netif *netif)\r
-{\r
- struct dhcp *dhcp = netif->dhcp;\r
- err_t result;\r
- u16_t msecs;\r
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_renew()\n"));\r
- dhcp_set_state(dhcp, DHCP_RENEWING);\r
-\r
- /* create and initialize the DHCP message header */\r
- result = dhcp_create_msg(netif, dhcp, DHCP_REQUEST);\r
- if (result == ERR_OK) {\r
- dhcp_option(dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);\r
- dhcp_option_short(dhcp, DHCP_MAX_MSG_LEN(netif));\r
-\r
-#if 0\r
- dhcp_option(dhcp, DHCP_OPTION_REQUESTED_IP, 4);\r
- dhcp_option_long(dhcp, ntohl(dhcp->offered_ip_addr.addr));\r
-#endif\r
-\r
-#if 0\r
- dhcp_option(dhcp, DHCP_OPTION_SERVER_ID, 4);\r
- dhcp_option_long(dhcp, ntohl(dhcp->server_ip_addr.addr));\r
-#endif\r
-\r
-#if LWIP_NETIF_HOSTNAME\r
- dhcp_option_hostname(dhcp, netif);\r
-#endif /* LWIP_NETIF_HOSTNAME */\r
-\r
- /* append DHCP message trailer */\r
- dhcp_option_trailer(dhcp);\r
-\r
- pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);\r
-\r
- udp_sendto_if(dhcp->pcb, dhcp->p_out, &dhcp->server_ip_addr, DHCP_SERVER_PORT, netif);\r
- dhcp_delete_msg(dhcp);\r
-\r
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_renew: RENEWING\n"));\r
- } else {\r
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("dhcp_renew: could not allocate DHCP request\n"));\r
- }\r
- dhcp->tries++;\r
- /* back-off on retries, but to a maximum of 20 seconds */\r
- msecs = dhcp->tries < 10 ? dhcp->tries * 2000 : 20 * 1000;\r
- dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;\r
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_renew(): set request timeout %"U16_F" msecs\n", msecs));\r
- return result;\r
-}\r
-\r
-/**\r
- * Rebind with a DHCP server for an existing DHCP lease.\r
- *\r
- * @param netif network interface which must rebind with a DHCP server\r
- */\r
-static err_t\r
-dhcp_rebind(struct netif *netif)\r
-{\r
- struct dhcp *dhcp = netif->dhcp;\r
- err_t result;\r
- u16_t msecs;\r
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_rebind()\n"));\r
- dhcp_set_state(dhcp, DHCP_REBINDING);\r
-\r
- /* create and initialize the DHCP message header */\r
- result = dhcp_create_msg(netif, dhcp, DHCP_REQUEST);\r
- if (result == ERR_OK) {\r
- dhcp_option(dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);\r
- dhcp_option_short(dhcp, DHCP_MAX_MSG_LEN(netif));\r
-\r
-#if LWIP_NETIF_HOSTNAME\r
- dhcp_option_hostname(dhcp, netif);\r
-#endif /* LWIP_NETIF_HOSTNAME */\r
-\r
-#if 0\r
- dhcp_option(dhcp, DHCP_OPTION_REQUESTED_IP, 4);\r
- dhcp_option_long(dhcp, ntohl(dhcp->offered_ip_addr.addr));\r
-\r
- dhcp_option(dhcp, DHCP_OPTION_SERVER_ID, 4);\r
- dhcp_option_long(dhcp, ntohl(dhcp->server_ip_addr.addr));\r
-#endif\r
-\r
- dhcp_option_trailer(dhcp);\r
-\r
- pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);\r
-\r
- /* broadcast to server */\r
- udp_sendto_if(dhcp->pcb, dhcp->p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);\r
- dhcp_delete_msg(dhcp);\r
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_rebind: REBINDING\n"));\r
- } else {\r
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("dhcp_rebind: could not allocate DHCP request\n"));\r
- }\r
- dhcp->tries++;\r
- msecs = dhcp->tries < 10 ? dhcp->tries * 1000 : 10 * 1000;\r
- dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;\r
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_rebind(): set request timeout %"U16_F" msecs\n", msecs));\r
- return result;\r
-}\r
-\r
-/**\r
- * Enter REBOOTING state to verify an existing lease\r
- *\r
- * @param netif network interface which must reboot\r
- */\r
-static err_t\r
-dhcp_reboot(struct netif *netif)\r
-{\r
- struct dhcp *dhcp = netif->dhcp;\r
- err_t result;\r
- u16_t msecs;\r
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_reboot()\n"));\r
- dhcp_set_state(dhcp, DHCP_REBOOTING);\r
-\r
- /* create and initialize the DHCP message header */\r
- result = dhcp_create_msg(netif, dhcp, DHCP_REQUEST);\r
- if (result == ERR_OK) {\r
- dhcp_option(dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);\r
- dhcp_option_short(dhcp, 576);\r
-\r
- dhcp_option(dhcp, DHCP_OPTION_REQUESTED_IP, 4);\r
- dhcp_option_long(dhcp, ntohl(ip4_addr_get_u32(&dhcp->offered_ip_addr)));\r
-\r
- dhcp_option_trailer(dhcp);\r
-\r
- pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);\r
-\r
- /* broadcast to server */\r
- udp_sendto_if(dhcp->pcb, dhcp->p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);\r
- dhcp_delete_msg(dhcp);\r
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_reboot: REBOOTING\n"));\r
- } else {\r
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("dhcp_reboot: could not allocate DHCP request\n"));\r
- }\r
- dhcp->tries++;\r
- msecs = dhcp->tries < 10 ? dhcp->tries * 1000 : 10 * 1000;\r
- dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;\r
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_reboot(): set request timeout %"U16_F" msecs\n", msecs));\r
- return result;\r
-}\r
-\r
-\r
-/**\r
- * Release a DHCP lease.\r
- *\r
- * @param netif network interface which must release its lease\r
- */\r
-err_t\r
-dhcp_release(struct netif *netif)\r
-{\r
- struct dhcp *dhcp = netif->dhcp;\r
- err_t result;\r
- u16_t msecs;\r
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_release()\n"));\r
- if (dhcp == NULL) {\r
- return ERR_ARG;\r
- }\r
-\r
- /* idle DHCP client */\r
- dhcp_set_state(dhcp, DHCP_OFF);\r
- /* clean old DHCP offer */\r
- ip_addr_set_zero(&dhcp->server_ip_addr);\r
- ip_addr_set_zero(&dhcp->offered_ip_addr);\r
- ip_addr_set_zero(&dhcp->offered_sn_mask);\r
- ip_addr_set_zero(&dhcp->offered_gw_addr);\r
-#if LWIP_DHCP_BOOTP_FILE\r
- ip_addr_set_zero(&dhcp->offered_si_addr);\r
-#endif /* LWIP_DHCP_BOOTP_FILE */\r
- dhcp->offered_t0_lease = dhcp->offered_t1_renew = dhcp->offered_t2_rebind = 0;\r
- \r
- /* create and initialize the DHCP message header */\r
- result = dhcp_create_msg(netif, dhcp, DHCP_RELEASE);\r
- if (result == ERR_OK) {\r
- dhcp_option_trailer(dhcp);\r
-\r
- pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);\r
-\r
- udp_sendto_if(dhcp->pcb, dhcp->p_out, &dhcp->server_ip_addr, DHCP_SERVER_PORT, netif);\r
- dhcp_delete_msg(dhcp);\r
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_release: RELEASED, DHCP_OFF\n"));\r
- } else {\r
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("dhcp_release: could not allocate DHCP request\n"));\r
- }\r
- dhcp->tries++;\r
- msecs = dhcp->tries < 10 ? dhcp->tries * 1000 : 10 * 1000;\r
- dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;\r
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_release(): set request timeout %"U16_F" msecs\n", msecs));\r
- /* bring the interface down */\r
- netif_set_down(netif);\r
- /* remove IP address from interface */\r
- netif_set_ipaddr(netif, IP_ADDR_ANY);\r
- netif_set_gw(netif, IP_ADDR_ANY);\r
- netif_set_netmask(netif, IP_ADDR_ANY);\r
- \r
- return result;\r
-}\r
-\r
-/**\r
- * Remove the DHCP client from the interface.\r
- *\r
- * @param netif The network interface to stop DHCP on\r
- */\r
-void\r
-dhcp_stop(struct netif *netif)\r
-{\r
- struct dhcp *dhcp;\r
- LWIP_ERROR("dhcp_stop: netif != NULL", (netif != NULL), return;);\r
- dhcp = netif->dhcp;\r
- /* Remove the flag that says this netif is handled by DHCP. */\r
- netif->flags &= ~NETIF_FLAG_DHCP;\r
-\r
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_stop()\n"));\r
- /* netif is DHCP configured? */\r
- if (dhcp != NULL) {\r
-#if LWIP_DHCP_AUTOIP_COOP\r
- if(dhcp->autoip_coop_state == DHCP_AUTOIP_COOP_STATE_ON) {\r
- autoip_stop(netif);\r
- dhcp->autoip_coop_state = DHCP_AUTOIP_COOP_STATE_OFF;\r
- }\r
-#endif /* LWIP_DHCP_AUTOIP_COOP */\r
-\r
- if (dhcp->pcb != NULL) {\r
- udp_remove(dhcp->pcb);\r
- dhcp->pcb = NULL;\r
- }\r
- LWIP_ASSERT("reply wasn't freed", dhcp->msg_in == NULL);\r
- dhcp_set_state(dhcp, DHCP_OFF);\r
- }\r
-}\r
-\r
-/*\r
- * Set the DHCP state of a DHCP client.\r
- *\r
- * If the state changed, reset the number of tries.\r
- */\r
-static void\r
-dhcp_set_state(struct dhcp *dhcp, u8_t new_state)\r
-{\r
- if (new_state != dhcp->state) {\r
- dhcp->state = new_state;\r
- dhcp->tries = 0;\r
- dhcp->request_timeout = 0;\r
- }\r
-}\r
-\r
-/*\r
- * Concatenate an option type and length field to the outgoing\r
- * DHCP message.\r
- *\r
- */\r
-static void\r
-dhcp_option(struct dhcp *dhcp, u8_t option_type, u8_t option_len)\r
-{\r
- LWIP_ASSERT("dhcp_option: dhcp->options_out_len + 2 + option_len <= DHCP_OPTIONS_LEN", dhcp->options_out_len + 2U + option_len <= DHCP_OPTIONS_LEN);\r
- dhcp->msg_out->options[dhcp->options_out_len++] = option_type;\r
- dhcp->msg_out->options[dhcp->options_out_len++] = option_len;\r
-}\r
-/*\r
- * Concatenate a single byte to the outgoing DHCP message.\r
- *\r
- */\r
-static void\r
-dhcp_option_byte(struct dhcp *dhcp, u8_t value)\r
-{\r
- LWIP_ASSERT("dhcp_option_byte: dhcp->options_out_len < DHCP_OPTIONS_LEN", dhcp->options_out_len < DHCP_OPTIONS_LEN);\r
- dhcp->msg_out->options[dhcp->options_out_len++] = value;\r
-}\r
-\r
-static void\r
-dhcp_option_short(struct dhcp *dhcp, u16_t value)\r
-{\r
- LWIP_ASSERT("dhcp_option_short: dhcp->options_out_len + 2 <= DHCP_OPTIONS_LEN", dhcp->options_out_len + 2U <= DHCP_OPTIONS_LEN);\r
- dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t)((value & 0xff00U) >> 8);\r
- dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t) (value & 0x00ffU);\r
-}\r
-\r
-static void\r
-dhcp_option_long(struct dhcp *dhcp, u32_t value)\r
-{\r
- LWIP_ASSERT("dhcp_option_long: dhcp->options_out_len + 4 <= DHCP_OPTIONS_LEN", dhcp->options_out_len + 4U <= DHCP_OPTIONS_LEN);\r
- dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t)((value & 0xff000000UL) >> 24);\r
- dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t)((value & 0x00ff0000UL) >> 16);\r
- dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t)((value & 0x0000ff00UL) >> 8);\r
- dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t)((value & 0x000000ffUL));\r
-}\r
-\r
-#if LWIP_NETIF_HOSTNAME\r
-static void\r
-dhcp_option_hostname(struct dhcp *dhcp, struct netif *netif)\r
-{\r
- if (netif->hostname != NULL) {\r
- size_t namelen = strlen(netif->hostname);\r
- if (namelen > 0) {\r
- u8_t len;\r
- const char *p = netif->hostname;\r
- /* Shrink len to available bytes (need 2 bytes for OPTION_HOSTNAME\r
- and 1 byte for trailer) */\r
- size_t available = DHCP_OPTIONS_LEN - dhcp->options_out_len - 3;\r
- LWIP_ASSERT("DHCP: hostname is too long!", namelen <= available);\r
- len = LWIP_MIN(namelen, available);\r
- dhcp_option(dhcp, DHCP_OPTION_HOSTNAME, len);\r
- while (len--) {\r
- dhcp_option_byte(dhcp, *p++);\r
- }\r
- }\r
- }\r
-}\r
-#endif /* LWIP_NETIF_HOSTNAME */\r
-\r
-/**\r
- * Extract the DHCP message and the DHCP options.\r
- *\r
- * Extract the DHCP message and the DHCP options, each into a contiguous\r
- * piece of memory. As a DHCP message is variable sized by its options,\r
- * and also allows overriding some fields for options, the easy approach\r
- * is to first unfold the options into a conitguous piece of memory, and\r
- * use that further on.\r
- *\r
- */\r
-static err_t\r
-dhcp_parse_reply(struct dhcp *dhcp, struct pbuf *p)\r
-{\r
- u8_t *options;\r
- u16_t offset;\r
- u16_t offset_max;\r
- u16_t options_idx;\r
- u16_t options_idx_max;\r
- struct pbuf *q;\r
- int parse_file_as_options = 0;\r
- int parse_sname_as_options = 0;\r
-\r
- /* clear received options */\r
- dhcp_clear_all_options(dhcp);\r
- /* check that beginning of dhcp_msg (up to and including chaddr) is in first pbuf */\r
- if (p->len < DHCP_SNAME_OFS) {\r
- return ERR_BUF;\r
- }\r
- dhcp->msg_in = (struct dhcp_msg *)p->payload;\r
-#if LWIP_DHCP_BOOTP_FILE\r
- /* clear boot file name */\r
- dhcp->boot_file_name[0] = 0;\r
-#endif /* LWIP_DHCP_BOOTP_FILE */\r
-\r
- /* parse options */\r
-\r
- /* start with options field */\r
- options_idx = DHCP_OPTIONS_OFS;\r
- /* parse options to the end of the received packet */\r
- options_idx_max = p->tot_len;\r
-again:\r
- q = p;\r
- while((q != NULL) && (options_idx >= q->len)) {\r
- options_idx -= q->len;\r
- options_idx_max -= q->len;\r
- q = q->next;\r
- }\r
- if (q == NULL) {\r
- return ERR_BUF;\r
- }\r
- offset = options_idx;\r
- offset_max = options_idx_max;\r
- options = (u8_t*)q->payload;\r
- /* at least 1 byte to read and no end marker, then at least 3 bytes to read? */\r
- while((q != NULL) && (options[offset] != DHCP_OPTION_END) && (offset < offset_max)) {\r
- u8_t op = options[offset];\r
- u8_t len;\r
- u8_t decode_len = 0;\r
- int decode_idx = -1;\r
- u16_t val_offset = offset + 2;\r
- /* len byte might be in the next pbuf */\r
- if (offset + 1 < q->len) {\r
- len = options[offset + 1];\r
- } else {\r
- len = (q->next != NULL ? ((u8_t*)q->next->payload)[0] : 0);\r
- }\r
- /* LWIP_DEBUGF(DHCP_DEBUG, ("msg_offset=%"U16_F", q->len=%"U16_F, msg_offset, q->len)); */\r
- decode_len = len;\r
- switch(op) {\r
- /* case(DHCP_OPTION_END): handled above */\r
- case(DHCP_OPTION_PAD):\r
- /* special option: no len encoded */\r
- decode_len = len = 0;\r
- /* will be increased below */\r
- offset--;\r
- break;\r
- case(DHCP_OPTION_SUBNET_MASK):\r
- LWIP_ERROR("len == 4", len == 4, return ERR_VAL;);\r
- decode_idx = DHCP_OPTION_IDX_SUBNET_MASK;\r
- break;\r
- case(DHCP_OPTION_ROUTER):\r
- decode_len = 4; /* only copy the first given router */\r
- LWIP_ERROR("len >= decode_len", len >= decode_len, return ERR_VAL;);\r
- decode_idx = DHCP_OPTION_IDX_ROUTER;\r
- break;\r
- case(DHCP_OPTION_DNS_SERVER):\r
- /* special case: there might be more than one server */\r
- LWIP_ERROR("len % 4 == 0", len % 4 == 0, return ERR_VAL;);\r
- /* limit number of DNS servers */\r
- decode_len = LWIP_MIN(len, 4 * DNS_MAX_SERVERS);\r
- LWIP_ERROR("len >= decode_len", len >= decode_len, return ERR_VAL;);\r
- decode_idx = DHCP_OPTION_IDX_DNS_SERVER;\r
- break;\r
- case(DHCP_OPTION_LEASE_TIME):\r
- LWIP_ERROR("len == 4", len == 4, return ERR_VAL;);\r
- decode_idx = DHCP_OPTION_IDX_LEASE_TIME;\r
- break;\r
- case(DHCP_OPTION_OVERLOAD):\r
- LWIP_ERROR("len == 1", len == 1, return ERR_VAL;);\r
- decode_idx = DHCP_OPTION_IDX_OVERLOAD;\r
- break;\r
- case(DHCP_OPTION_MESSAGE_TYPE):\r
- LWIP_ERROR("len == 1", len == 1, return ERR_VAL;);\r
- decode_idx = DHCP_OPTION_IDX_MSG_TYPE;\r
- break;\r
- case(DHCP_OPTION_SERVER_ID):\r
- LWIP_ERROR("len == 4", len == 4, return ERR_VAL;);\r
- decode_idx = DHCP_OPTION_IDX_SERVER_ID;\r
- break;\r
- case(DHCP_OPTION_T1):\r
- LWIP_ERROR("len == 4", len == 4, return ERR_VAL;);\r
- decode_idx = DHCP_OPTION_IDX_T1;\r
- break;\r
- case(DHCP_OPTION_T2):\r
- LWIP_ERROR("len == 4", len == 4, return ERR_VAL;);\r
- decode_idx = DHCP_OPTION_IDX_T2;\r
- break;\r
- default:\r
- decode_len = 0;\r
- LWIP_DEBUGF(DHCP_DEBUG, ("skipping option %"U16_F" in options\n", op));\r
- break;\r
- }\r
- offset += len + 2;\r
- if (decode_len > 0) {\r
- u32_t value = 0;\r
- u16_t copy_len;\r
-decode_next:\r
- LWIP_ASSERT("check decode_idx", decode_idx >= 0 && decode_idx < DHCP_OPTION_IDX_MAX);\r
- if (!dhcp_option_given(dhcp, decode_idx)) {\r
- copy_len = LWIP_MIN(decode_len, 4);\r
- pbuf_copy_partial(q, &value, copy_len, val_offset);\r
- if (decode_len > 4) {\r
- /* decode more than one u32_t */\r
- LWIP_ERROR("decode_len % 4 == 0", decode_len % 4 == 0, return ERR_VAL;);\r
- dhcp_got_option(dhcp, decode_idx);\r
- dhcp_set_option_value(dhcp, decode_idx, htonl(value));\r
- decode_len -= 4;\r
- val_offset += 4;\r
- decode_idx++;\r
- goto decode_next;\r
- } else if (decode_len == 4) {\r
- value = ntohl(value);\r
- } else {\r
- LWIP_ERROR("invalid decode_len", decode_len == 1, return ERR_VAL;);\r
- value = ((u8_t*)&value)[0];\r
- }\r
- dhcp_got_option(dhcp, decode_idx);\r
- dhcp_set_option_value(dhcp, decode_idx, value);\r
- }\r
- }\r
- if (offset >= q->len) {\r
- offset -= q->len;\r
- offset_max -= q->len;\r
- if ((offset < offset_max) && offset_max) {\r
- q = q->next;\r
- LWIP_ASSERT("next pbuf was null", q);\r
- options = (u8_t*)q->payload;\r
- } else {\r
- /* We've run out of bytes, probably no end marker. Don't proceed. */\r
- break;\r
- }\r
- }\r
- }\r
- /* is this an overloaded message? */\r
- if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_OVERLOAD)) {\r
- u32_t overload = dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_OVERLOAD);\r
- dhcp_clear_option(dhcp, DHCP_OPTION_IDX_OVERLOAD);\r
- if (overload == DHCP_OVERLOAD_FILE) {\r
- parse_file_as_options = 1;\r
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("overloaded file field\n"));\r
- } else if (overload == DHCP_OVERLOAD_SNAME) {\r
- parse_sname_as_options = 1;\r
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("overloaded sname field\n"));\r
- } else if (overload == DHCP_OVERLOAD_SNAME_FILE) {\r
- parse_sname_as_options = 1;\r
- parse_file_as_options = 1;\r
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("overloaded sname and file field\n"));\r
- } else {\r
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("invalid overload option: %d\n", (int)overload));\r
- }\r
-#if LWIP_DHCP_BOOTP_FILE\r
- if (!parse_file_as_options) {\r
- /* only do this for ACK messages */\r
- if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_MSG_TYPE) &&\r
- (dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_MSG_TYPE) == DHCP_ACK))\r
- /* copy bootp file name, don't care for sname (server hostname) */\r
- pbuf_copy_partial(p, dhcp->boot_file_name, DHCP_FILE_LEN-1, DHCP_FILE_OFS);\r
- /* make sure the string is really NULL-terminated */\r
- dhcp->boot_file_name[DHCP_FILE_LEN-1] = 0;\r
- }\r
-#endif /* LWIP_DHCP_BOOTP_FILE */\r
- }\r
- if (parse_file_as_options) {\r
- /* if both are overloaded, parse file first and then sname (RFC 2131 ch. 4.1) */\r
- parse_file_as_options = 0;\r
- options_idx = DHCP_FILE_OFS;\r
- options_idx_max = DHCP_FILE_OFS + DHCP_FILE_LEN;\r
- goto again;\r
- } else if (parse_sname_as_options) {\r
- parse_sname_as_options = 0;\r
- options_idx = DHCP_SNAME_OFS;\r
- options_idx_max = DHCP_SNAME_OFS + DHCP_SNAME_LEN;\r
- goto again;\r
- }\r
- return ERR_OK;\r
-}\r
-\r
-/**\r
- * If an incoming DHCP message is in response to us, then trigger the state machine\r
- */\r
-static void\r
-dhcp_recv(void *arg, struct udp_pcb *pcb, struct pbuf *p, ip_addr_t *addr, u16_t port)\r
-{\r
- struct netif *netif = (struct netif *)arg;\r
- struct dhcp *dhcp = netif->dhcp;\r
- struct dhcp_msg *reply_msg = (struct dhcp_msg *)p->payload;\r
- u8_t msg_type;\r
- u8_t i;\r
- 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,\r
- ip4_addr1_16(addr), ip4_addr2_16(addr), ip4_addr3_16(addr), ip4_addr4_16(addr), port));\r
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("pbuf->len = %"U16_F"\n", p->len));\r
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("pbuf->tot_len = %"U16_F"\n", p->tot_len));\r
- /* prevent warnings about unused arguments */\r
- LWIP_UNUSED_ARG(pcb);\r
- LWIP_UNUSED_ARG(addr);\r
- LWIP_UNUSED_ARG(port);\r
-\r
- LWIP_ASSERT("reply wasn't freed", dhcp->msg_in == NULL);\r
-\r
- if (p->len < DHCP_MIN_REPLY_LEN) {\r
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_WARNING, ("DHCP reply message or pbuf too short\n"));\r
- goto free_pbuf_and_return;\r
- }\r
-\r
- if (reply_msg->op != DHCP_BOOTREPLY) {\r
- 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));\r
- goto free_pbuf_and_return;\r
- }\r
- /* iterate through hardware address and match against DHCP message */\r
- for (i = 0; i < netif->hwaddr_len; i++) {\r
- if (netif->hwaddr[i] != reply_msg->chaddr[i]) {\r
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_WARNING,\r
- ("netif->hwaddr[%"U16_F"]==%02"X16_F" != reply_msg->chaddr[%"U16_F"]==%02"X16_F"\n",\r
- (u16_t)i, (u16_t)netif->hwaddr[i], (u16_t)i, (u16_t)reply_msg->chaddr[i]));\r
- goto free_pbuf_and_return;\r
- }\r
- }\r
- /* match transaction ID against what we expected */\r
- if (ntohl(reply_msg->xid) != dhcp->xid) {\r
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_WARNING,\r
- ("transaction id mismatch reply_msg->xid(%"X32_F")!=dhcp->xid(%"X32_F")\n",ntohl(reply_msg->xid),dhcp->xid));\r
- goto free_pbuf_and_return;\r
- }\r
- /* option fields could be unfold? */\r
- if (dhcp_parse_reply(dhcp, p) != ERR_OK) {\r
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS,\r
- ("problem unfolding DHCP message - too short on memory?\n"));\r
- goto free_pbuf_and_return;\r
- }\r
-\r
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("searching DHCP_OPTION_MESSAGE_TYPE\n"));\r
- /* obtain pointer to DHCP message type */\r
- if (!dhcp_option_given(dhcp, DHCP_OPTION_IDX_MSG_TYPE)) {\r
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_WARNING, ("DHCP_OPTION_MESSAGE_TYPE option not found\n"));\r
- goto free_pbuf_and_return;\r
- }\r
-\r
- /* read DHCP message type */\r
- msg_type = (u8_t)dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_MSG_TYPE);\r
- /* message type is DHCP ACK? */\r
- if (msg_type == DHCP_ACK) {\r
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("DHCP_ACK received\n"));\r
- /* in requesting state? */\r
- if (dhcp->state == DHCP_REQUESTING) {\r
- dhcp_handle_ack(netif);\r
-#if DHCP_DOES_ARP_CHECK\r
- /* check if the acknowledged lease address is already in use */\r
- dhcp_check(netif);\r
-#else\r
- /* bind interface to the acknowledged lease address */\r
- dhcp_bind(netif);\r
-#endif\r
- }\r
- /* already bound to the given lease address? */\r
- else if ((dhcp->state == DHCP_REBOOTING) || (dhcp->state == DHCP_REBINDING) || (dhcp->state == DHCP_RENEWING)) {\r
- dhcp_bind(netif);\r
- }\r
- }\r
- /* received a DHCP_NAK in appropriate state? */\r
- else if ((msg_type == DHCP_NAK) &&\r
- ((dhcp->state == DHCP_REBOOTING) || (dhcp->state == DHCP_REQUESTING) ||\r
- (dhcp->state == DHCP_REBINDING) || (dhcp->state == DHCP_RENEWING ))) {\r
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("DHCP_NAK received\n"));\r
- dhcp_handle_nak(netif);\r
- }\r
- /* received a DHCP_OFFER in DHCP_SELECTING state? */\r
- else if ((msg_type == DHCP_OFFER) && (dhcp->state == DHCP_SELECTING)) {\r
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("DHCP_OFFER received in DHCP_SELECTING state\n"));\r
- dhcp->request_timeout = 0;\r
- /* remember offered lease */\r
- dhcp_handle_offer(netif);\r
- }\r
-free_pbuf_and_return:\r
- dhcp->msg_in = NULL;\r
- pbuf_free(p);\r
-}\r
-\r
-/**\r
- * Create a DHCP request, fill in common headers\r
- *\r
- * @param netif the netif under DHCP control\r
- * @param dhcp dhcp control struct\r
- * @param message_type message type of the request\r
- */\r
-static err_t\r
-dhcp_create_msg(struct netif *netif, struct dhcp *dhcp, u8_t message_type)\r
-{\r
- u16_t i;\r
-#ifndef DHCP_GLOBAL_XID\r
- /** default global transaction identifier starting value (easy to match\r
- * with a packet analyser). We simply increment for each new request.\r
- * Predefine DHCP_GLOBAL_XID to a better value or a function call to generate one\r
- * at runtime, any supporting function prototypes can be defined in DHCP_GLOBAL_XID_HEADER */\r
-#if DHCP_CREATE_RAND_XID && defined(LWIP_RAND)\r
- static u32_t xid;\r
-#else /* DHCP_CREATE_RAND_XID && defined(LWIP_RAND) */\r
- static u32_t xid = 0xABCD0000;\r
-#endif /* DHCP_CREATE_RAND_XID && defined(LWIP_RAND) */\r
-#else\r
- if (!xid_initialised) {\r
- xid = DHCP_GLOBAL_XID;\r
- xid_initialised = !xid_initialised;\r
- }\r
-#endif\r
- LWIP_ERROR("dhcp_create_msg: netif != NULL", (netif != NULL), return ERR_ARG;);\r
- LWIP_ERROR("dhcp_create_msg: dhcp != NULL", (dhcp != NULL), return ERR_VAL;);\r
- LWIP_ASSERT("dhcp_create_msg: dhcp->p_out == NULL", dhcp->p_out == NULL);\r
- LWIP_ASSERT("dhcp_create_msg: dhcp->msg_out == NULL", dhcp->msg_out == NULL);\r
- dhcp->p_out = pbuf_alloc(PBUF_TRANSPORT, sizeof(struct dhcp_msg), PBUF_RAM);\r
- if (dhcp->p_out == NULL) {\r
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS,\r
- ("dhcp_create_msg(): could not allocate pbuf\n"));\r
- return ERR_MEM;\r
- }\r
- LWIP_ASSERT("dhcp_create_msg: check that first pbuf can hold struct dhcp_msg",\r
- (dhcp->p_out->len >= sizeof(struct dhcp_msg)));\r
-\r
- /* reuse transaction identifier in retransmissions */\r
- if (dhcp->tries == 0) {\r
-#if DHCP_CREATE_RAND_XID && defined(LWIP_RAND)\r
- xid = LWIP_RAND();\r
-#else /* DHCP_CREATE_RAND_XID && defined(LWIP_RAND) */\r
- xid++;\r
-#endif /* DHCP_CREATE_RAND_XID && defined(LWIP_RAND) */\r
- }\r
- dhcp->xid = xid;\r
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE,\r
- ("transaction id xid(%"X32_F")\n", xid));\r
-\r
- dhcp->msg_out = (struct dhcp_msg *)dhcp->p_out->payload;\r
-\r
- dhcp->msg_out->op = DHCP_BOOTREQUEST;\r
- /* TODO: make link layer independent */\r
- dhcp->msg_out->htype = DHCP_HTYPE_ETH;\r
- dhcp->msg_out->hlen = netif->hwaddr_len;\r
- dhcp->msg_out->hops = 0;\r
- dhcp->msg_out->xid = htonl(dhcp->xid);\r
- dhcp->msg_out->secs = 0;\r
- /* we don't need the broadcast flag since we can receive unicast traffic\r
- before being fully configured! */\r
- dhcp->msg_out->flags = 0;\r
- ip_addr_set_zero(&dhcp->msg_out->ciaddr);\r
- /* set ciaddr to netif->ip_addr based on message_type and state */\r
- if ((message_type == DHCP_INFORM) || (message_type == DHCP_DECLINE) ||\r
- ((message_type == DHCP_REQUEST) && /* DHCP_BOUND not used for sending! */\r
- ((dhcp->state==DHCP_RENEWING) || dhcp->state==DHCP_REBINDING))) {\r
- ip_addr_copy(dhcp->msg_out->ciaddr, netif->ip_addr);\r
- }\r
- ip_addr_set_zero(&dhcp->msg_out->yiaddr);\r
- ip_addr_set_zero(&dhcp->msg_out->siaddr);\r
- ip_addr_set_zero(&dhcp->msg_out->giaddr);\r
- for (i = 0; i < DHCP_CHADDR_LEN; i++) {\r
- /* copy netif hardware address, pad with zeroes */\r
- dhcp->msg_out->chaddr[i] = (i < netif->hwaddr_len && i < NETIF_MAX_HWADDR_LEN) ? netif->hwaddr[i] : 0/* pad byte*/;\r
- }\r
- for (i = 0; i < DHCP_SNAME_LEN; i++) {\r
- dhcp->msg_out->sname[i] = 0;\r
- }\r
- for (i = 0; i < DHCP_FILE_LEN; i++) {\r
- dhcp->msg_out->file[i] = 0;\r
- }\r
- dhcp->msg_out->cookie = PP_HTONL(DHCP_MAGIC_COOKIE);\r
- dhcp->options_out_len = 0;\r
- /* fill options field with an incrementing array (for debugging purposes) */\r
- for (i = 0; i < DHCP_OPTIONS_LEN; i++) {\r
- dhcp->msg_out->options[i] = (u8_t)i; /* for debugging only, no matter if truncated */\r
- }\r
- /* Add option MESSAGE_TYPE */\r
- dhcp_option(dhcp, DHCP_OPTION_MESSAGE_TYPE, DHCP_OPTION_MESSAGE_TYPE_LEN);\r
- dhcp_option_byte(dhcp, message_type);\r
- return ERR_OK;\r
-}\r
-\r
-/**\r
- * Free previously allocated memory used to send a DHCP request.\r
- *\r
- * @param dhcp the dhcp struct to free the request from\r
- */\r
-static void\r
-dhcp_delete_msg(struct dhcp *dhcp)\r
-{\r
- LWIP_ERROR("dhcp_delete_msg: dhcp != NULL", (dhcp != NULL), return;);\r
- LWIP_ASSERT("dhcp_delete_msg: dhcp->p_out != NULL", dhcp->p_out != NULL);\r
- LWIP_ASSERT("dhcp_delete_msg: dhcp->msg_out != NULL", dhcp->msg_out != NULL);\r
- if (dhcp->p_out != NULL) {\r
- pbuf_free(dhcp->p_out);\r
- }\r
- dhcp->p_out = NULL;\r
- dhcp->msg_out = NULL;\r
-}\r
-\r
-/**\r
- * Add a DHCP message trailer\r
- *\r
- * Adds the END option to the DHCP message, and if\r
- * necessary, up to three padding bytes.\r
- *\r
- * @param dhcp DHCP state structure\r
- */\r
-static void\r
-dhcp_option_trailer(struct dhcp *dhcp)\r
-{\r
- LWIP_ERROR("dhcp_option_trailer: dhcp != NULL", (dhcp != NULL), return;);\r
- LWIP_ASSERT("dhcp_option_trailer: dhcp->msg_out != NULL\n", dhcp->msg_out != NULL);\r
- LWIP_ASSERT("dhcp_option_trailer: dhcp->options_out_len < DHCP_OPTIONS_LEN\n", dhcp->options_out_len < DHCP_OPTIONS_LEN);\r
- dhcp->msg_out->options[dhcp->options_out_len++] = DHCP_OPTION_END;\r
- /* packet is too small, or not 4 byte aligned? */\r
- while (((dhcp->options_out_len < DHCP_MIN_OPTIONS_LEN) || (dhcp->options_out_len & 3)) &&\r
- (dhcp->options_out_len < DHCP_OPTIONS_LEN)) {\r
- /* add a fill/padding byte */\r
- dhcp->msg_out->options[dhcp->options_out_len++] = 0;\r
- }\r
-}\r
-\r
-#endif /* LWIP_DHCP */\r
+/**
+ * @file
+ * Dynamic Host Configuration Protocol client
+ *
+ */
+
+/*
+ *
+ * Copyright (c) 2001-2004 Leon Woestenberg <leon.woestenberg@gmx.net>
+ * Copyright (c) 2001-2004 Axon Digital Design B.V., The Netherlands.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * This file is a contribution to the lwIP TCP/IP stack.
+ * The Swedish Institute of Computer Science and Adam Dunkels
+ * are specifically granted permission to redistribute this
+ * source code.
+ *
+ * Author: Leon Woestenberg <leon.woestenberg@gmx.net>
+ *
+ * This is a DHCP client for the lwIP TCP/IP stack. It aims to conform
+ * with RFC 2131 and RFC 2132.
+ *
+ * TODO:
+ * - Support for interfaces other than Ethernet (SLIP, PPP, ...)
+ *
+ * Please coordinate changes and requests with Leon Woestenberg
+ * <leon.woestenberg@gmx.net>
+ *
+ * Integration with your code:
+ *
+ * In lwip/dhcp.h
+ * #define DHCP_COARSE_TIMER_SECS (recommended 60 which is a minute)
+ * #define DHCP_FINE_TIMER_MSECS (recommended 500 which equals TCP coarse timer)
+ *
+ * Then have your application call dhcp_coarse_tmr() and
+ * dhcp_fine_tmr() on the defined intervals.
+ *
+ * dhcp_start(struct netif *netif);
+ * starts a DHCP client instance which configures the interface by
+ * obtaining an IP address lease and maintaining it.
+ *
+ * Use dhcp_release(netif) to end the lease and use dhcp_stop(netif)
+ * to remove the DHCP client.
+ *
+ */
+
+#include "lwip/opt.h"
+
+#if LWIP_DHCP /* don't build if not configured for use in lwipopts.h */
+
+#include "lwip/stats.h"
+#include "lwip/mem.h"
+#include "lwip/udp.h"
+#include "lwip/ip_addr.h"
+#include "lwip/netif.h"
+#include "lwip/def.h"
+#include "lwip/dhcp.h"
+#include "lwip/autoip.h"
+#include "lwip/dns.h"
+#include "netif/etharp.h"
+
+#include <string.h>
+
+/** DHCP_CREATE_RAND_XID: if this is set to 1, the xid is created using
+ * LWIP_RAND() (this overrides DHCP_GLOBAL_XID)
+ */
+#ifndef DHCP_CREATE_RAND_XID
+#define DHCP_CREATE_RAND_XID 1
+#endif
+
+/** Default for DHCP_GLOBAL_XID is 0xABCD0000
+ * This can be changed by defining DHCP_GLOBAL_XID and DHCP_GLOBAL_XID_HEADER, e.g.
+ * #define DHCP_GLOBAL_XID_HEADER "stdlib.h"
+ * #define DHCP_GLOBAL_XID rand()
+ */
+#ifdef DHCP_GLOBAL_XID_HEADER
+#include DHCP_GLOBAL_XID_HEADER /* include optional starting XID generation prototypes */
+#endif
+
+/** DHCP_OPTION_MAX_MSG_SIZE is set to the MTU
+ * MTU is checked to be big enough in dhcp_start */
+#define DHCP_MAX_MSG_LEN(netif) (netif->mtu)
+#define DHCP_MAX_MSG_LEN_MIN_REQUIRED 576
+/** Minimum length for reply before packet is parsed */
+#define DHCP_MIN_REPLY_LEN 44
+
+#define REBOOT_TRIES 2
+
+/** Option handling: options are parsed in dhcp_parse_reply
+ * and saved in an array where other functions can load them from.
+ * This might be moved into the struct dhcp (not necessarily since
+ * lwIP is single-threaded and the array is only used while in recv
+ * callback). */
+#define DHCP_OPTION_IDX_OVERLOAD 0
+#define DHCP_OPTION_IDX_MSG_TYPE 1
+#define DHCP_OPTION_IDX_SERVER_ID 2
+#define DHCP_OPTION_IDX_LEASE_TIME 3
+#define DHCP_OPTION_IDX_T1 4
+#define DHCP_OPTION_IDX_T2 5
+#define DHCP_OPTION_IDX_SUBNET_MASK 6
+#define DHCP_OPTION_IDX_ROUTER 7
+#define DHCP_OPTION_IDX_DNS_SERVER 8
+#define DHCP_OPTION_IDX_MAX (DHCP_OPTION_IDX_DNS_SERVER + DNS_MAX_SERVERS)
+
+/** Holds the decoded option values, only valid while in dhcp_recv.
+ @todo: move this into struct dhcp? */
+u32_t dhcp_rx_options_val[DHCP_OPTION_IDX_MAX];
+/** Holds a flag which option was received and is contained in dhcp_rx_options_val,
+ only valid while in dhcp_recv.
+ @todo: move this into struct dhcp? */
+u8_t dhcp_rx_options_given[DHCP_OPTION_IDX_MAX];
+
+#ifdef DHCP_GLOBAL_XID
+static u32_t xid;
+static u8_t xid_initialised;
+#endif /* DHCP_GLOBAL_XID */
+
+#define dhcp_option_given(dhcp, idx) (dhcp_rx_options_given[idx] != 0)
+#define dhcp_got_option(dhcp, idx) (dhcp_rx_options_given[idx] = 1)
+#define dhcp_clear_option(dhcp, idx) (dhcp_rx_options_given[idx] = 0)
+#define dhcp_clear_all_options(dhcp) (memset(dhcp_rx_options_given, 0, sizeof(dhcp_rx_options_given)))
+#define dhcp_get_option_value(dhcp, idx) (dhcp_rx_options_val[idx])
+#define dhcp_set_option_value(dhcp, idx, val) (dhcp_rx_options_val[idx] = (val))
+
+
+/* DHCP client state machine functions */
+static err_t dhcp_discover(struct netif *netif);
+static err_t dhcp_select(struct netif *netif);
+static void dhcp_bind(struct netif *netif);
+#if DHCP_DOES_ARP_CHECK
+static err_t dhcp_decline(struct netif *netif);
+#endif /* DHCP_DOES_ARP_CHECK */
+static err_t dhcp_rebind(struct netif *netif);
+static err_t dhcp_reboot(struct netif *netif);
+static void dhcp_set_state(struct dhcp *dhcp, u8_t new_state);
+
+/* receive, unfold, parse and free incoming messages */
+static void dhcp_recv(void *arg, struct udp_pcb *pcb, struct pbuf *p, ip_addr_t *addr, u16_t port);
+
+/* set the DHCP timers */
+static void dhcp_timeout(struct netif *netif);
+static void dhcp_t1_timeout(struct netif *netif);
+static void dhcp_t2_timeout(struct netif *netif);
+
+/* build outgoing messages */
+/* create a DHCP message, fill in common headers */
+static err_t dhcp_create_msg(struct netif *netif, struct dhcp *dhcp, u8_t message_type);
+/* free a DHCP request */
+static void dhcp_delete_msg(struct dhcp *dhcp);
+/* add a DHCP option (type, then length in bytes) */
+static void dhcp_option(struct dhcp *dhcp, u8_t option_type, u8_t option_len);
+/* add option values */
+static void dhcp_option_byte(struct dhcp *dhcp, u8_t value);
+static void dhcp_option_short(struct dhcp *dhcp, u16_t value);
+static void dhcp_option_long(struct dhcp *dhcp, u32_t value);
+#if LWIP_NETIF_HOSTNAME
+static void dhcp_option_hostname(struct dhcp *dhcp, struct netif *netif);
+#endif /* LWIP_NETIF_HOSTNAME */
+/* always add the DHCP options trailer to end and pad */
+static void dhcp_option_trailer(struct dhcp *dhcp);
+
+/**
+ * Back-off the DHCP client (because of a received NAK response).
+ *
+ * Back-off the DHCP client because of a received NAK. Receiving a
+ * NAK means the client asked for something non-sensible, for
+ * example when it tries to renew a lease obtained on another network.
+ *
+ * We clear any existing set IP address and restart DHCP negotiation
+ * afresh (as per RFC2131 3.2.3).
+ *
+ * @param netif the netif under DHCP control
+ */
+static void
+dhcp_handle_nak(struct netif *netif)
+{
+ struct dhcp *dhcp = netif->dhcp;
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_handle_nak(netif=%p) %c%c%"U16_F"\n",
+ (void*)netif, netif->name[0], netif->name[1], (u16_t)netif->num));
+ /* Set the interface down since the address must no longer be used, as per RFC2131 */
+ netif_set_down(netif);
+ /* remove IP address from interface */
+ netif_set_ipaddr(netif, IP_ADDR_ANY);
+ netif_set_gw(netif, IP_ADDR_ANY);
+ netif_set_netmask(netif, IP_ADDR_ANY);
+ /* Change to a defined state */
+ dhcp_set_state(dhcp, DHCP_BACKING_OFF);
+ /* We can immediately restart discovery */
+ dhcp_discover(netif);
+}
+
+#if DHCP_DOES_ARP_CHECK
+/**
+ * Checks if the offered IP address is already in use.
+ *
+ * It does so by sending an ARP request for the offered address and
+ * entering CHECKING state. If no ARP reply is received within a small
+ * interval, the address is assumed to be free for use by us.
+ *
+ * @param netif the netif under DHCP control
+ */
+static void
+dhcp_check(struct netif *netif)
+{
+ struct dhcp *dhcp = netif->dhcp;
+ err_t result;
+ u16_t msecs;
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_check(netif=%p) %c%c\n", (void *)netif, (s16_t)netif->name[0],
+ (s16_t)netif->name[1]));
+ dhcp_set_state(dhcp, DHCP_CHECKING);
+ /* create an ARP query for the offered IP address, expecting that no host
+ responds, as the IP address should not be in use. */
+ result = etharp_query(netif, &dhcp->offered_ip_addr, NULL);
+ if (result != ERR_OK) {
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_WARNING, ("dhcp_check: could not perform ARP query\n"));
+ }
+ dhcp->tries++;
+ msecs = 500;
+ dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_check(): set request timeout %"U16_F" msecs\n", msecs));
+}
+#endif /* DHCP_DOES_ARP_CHECK */
+
+/**
+ * Remember the configuration offered by a DHCP server.
+ *
+ * @param netif the netif under DHCP control
+ */
+static void
+dhcp_handle_offer(struct netif *netif)
+{
+ struct dhcp *dhcp = netif->dhcp;
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_handle_offer(netif=%p) %c%c%"U16_F"\n",
+ (void*)netif, netif->name[0], netif->name[1], (u16_t)netif->num));
+ /* obtain the server address */
+ if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_SERVER_ID)) {
+ ip4_addr_set_u32(&dhcp->server_ip_addr, htonl(dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_SERVER_ID)));
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_STATE, ("dhcp_handle_offer(): server 0x%08"X32_F"\n",
+ ip4_addr_get_u32(&dhcp->server_ip_addr)));
+ /* remember offered address */
+ ip_addr_copy(dhcp->offered_ip_addr, dhcp->msg_in->yiaddr);
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_STATE, ("dhcp_handle_offer(): offer for 0x%08"X32_F"\n",
+ ip4_addr_get_u32(&dhcp->offered_ip_addr)));
+
+ dhcp_select(netif);
+ } else {
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS,
+ ("dhcp_handle_offer(netif=%p) did not get server ID!\n", (void*)netif));
+ }
+}
+
+/**
+ * Select a DHCP server offer out of all offers.
+ *
+ * Simply select the first offer received.
+ *
+ * @param netif the netif under DHCP control
+ * @return lwIP specific error (see error.h)
+ */
+static err_t
+dhcp_select(struct netif *netif)
+{
+ struct dhcp *dhcp = netif->dhcp;
+ err_t result;
+ u16_t msecs;
+
+ 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));
+ dhcp_set_state(dhcp, DHCP_REQUESTING);
+
+ /* create and initialize the DHCP message header */
+ result = dhcp_create_msg(netif, dhcp, DHCP_REQUEST);
+ if (result == ERR_OK) {
+ dhcp_option(dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
+ dhcp_option_short(dhcp, DHCP_MAX_MSG_LEN(netif));
+
+ /* MUST request the offered IP address */
+ dhcp_option(dhcp, DHCP_OPTION_REQUESTED_IP, 4);
+ dhcp_option_long(dhcp, ntohl(ip4_addr_get_u32(&dhcp->offered_ip_addr)));
+
+ dhcp_option(dhcp, DHCP_OPTION_SERVER_ID, 4);
+ dhcp_option_long(dhcp, ntohl(ip4_addr_get_u32(&dhcp->server_ip_addr)));
+
+ dhcp_option(dhcp, DHCP_OPTION_PARAMETER_REQUEST_LIST, 4/*num options*/);
+ dhcp_option_byte(dhcp, DHCP_OPTION_SUBNET_MASK);
+ dhcp_option_byte(dhcp, DHCP_OPTION_ROUTER);
+ dhcp_option_byte(dhcp, DHCP_OPTION_BROADCAST);
+ dhcp_option_byte(dhcp, DHCP_OPTION_DNS_SERVER);
+
+#if LWIP_NETIF_HOSTNAME
+ dhcp_option_hostname(dhcp, netif);
+#endif /* LWIP_NETIF_HOSTNAME */
+
+ dhcp_option_trailer(dhcp);
+ /* shrink the pbuf to the actual content length */
+ pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
+
+ /* send broadcast to any DHCP server */
+ udp_sendto_if(dhcp->pcb, dhcp->p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
+ dhcp_delete_msg(dhcp);
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_select: REQUESTING\n"));
+ } else {
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_WARNING, ("dhcp_select: could not allocate DHCP request\n"));
+ }
+ dhcp->tries++;
+ msecs = (dhcp->tries < 6 ? 1 << dhcp->tries : 60) * 1000;
+ dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_STATE, ("dhcp_select(): set request timeout %"U16_F" msecs\n", msecs));
+ return result;
+}
+
+/**
+ * The DHCP timer that checks for lease renewal/rebind timeouts.
+ */
+void
+dhcp_coarse_tmr()
+{
+ struct netif *netif = netif_list;
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_coarse_tmr()\n"));
+ /* iterate through all network interfaces */
+ while (netif != NULL) {
+ /* only act on DHCP configured interfaces */
+ if (netif->dhcp != NULL) {
+ /* timer is active (non zero), and triggers (zeroes) now? */
+ if (netif->dhcp->t2_timeout-- == 1) {
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_coarse_tmr(): t2 timeout\n"));
+ /* this clients' rebind timeout triggered */
+ dhcp_t2_timeout(netif);
+ /* timer is active (non zero), and triggers (zeroes) now */
+ } else if (netif->dhcp->t1_timeout-- == 1) {
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_coarse_tmr(): t1 timeout\n"));
+ /* this clients' renewal timeout triggered */
+ dhcp_t1_timeout(netif);
+ }
+ }
+ /* proceed to next netif */
+ netif = netif->next;
+ }
+}
+
+/**
+ * DHCP transaction timeout handling
+ *
+ * A DHCP server is expected to respond within a short period of time.
+ * This timer checks whether an outstanding DHCP request is timed out.
+ */
+void
+dhcp_fine_tmr()
+{
+ struct netif *netif = netif_list;
+ /* loop through netif's */
+ while (netif != NULL) {
+ /* only act on DHCP configured interfaces */
+ if (netif->dhcp != NULL) {
+ /* timer is active (non zero), and is about to trigger now */
+ if (netif->dhcp->request_timeout > 1) {
+ netif->dhcp->request_timeout--;
+ }
+ else if (netif->dhcp->request_timeout == 1) {
+ netif->dhcp->request_timeout--;
+ /* { netif->dhcp->request_timeout == 0 } */
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_fine_tmr(): request timeout\n"));
+ /* this client's request timeout triggered */
+ dhcp_timeout(netif);
+ }
+ }
+ /* proceed to next network interface */
+ netif = netif->next;
+ }
+}
+
+/**
+ * A DHCP negotiation transaction, or ARP request, has timed out.
+ *
+ * The timer that was started with the DHCP or ARP request has
+ * timed out, indicating no response was received in time.
+ *
+ * @param netif the netif under DHCP control
+ */
+static void
+dhcp_timeout(struct netif *netif)
+{
+ struct dhcp *dhcp = netif->dhcp;
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_timeout()\n"));
+ /* back-off period has passed, or server selection timed out */
+ if ((dhcp->state == DHCP_BACKING_OFF) || (dhcp->state == DHCP_SELECTING)) {
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_timeout(): restarting discovery\n"));
+ dhcp_discover(netif);
+ /* receiving the requested lease timed out */
+ } else if (dhcp->state == DHCP_REQUESTING) {
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_timeout(): REQUESTING, DHCP request timed out\n"));
+ if (dhcp->tries <= 5) {
+ dhcp_select(netif);
+ } else {
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_timeout(): REQUESTING, releasing, restarting\n"));
+ dhcp_release(netif);
+ dhcp_discover(netif);
+ }
+#if DHCP_DOES_ARP_CHECK
+ /* received no ARP reply for the offered address (which is good) */
+ } else if (dhcp->state == DHCP_CHECKING) {
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_timeout(): CHECKING, ARP request timed out\n"));
+ if (dhcp->tries <= 1) {
+ dhcp_check(netif);
+ /* no ARP replies on the offered address,
+ looks like the IP address is indeed free */
+ } else {
+ /* bind the interface to the offered address */
+ dhcp_bind(netif);
+ }
+#endif /* DHCP_DOES_ARP_CHECK */
+ }
+ /* did not get response to renew request? */
+ else if (dhcp->state == DHCP_RENEWING) {
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_timeout(): RENEWING, DHCP request timed out\n"));
+ /* just retry renewal */
+ /* note that the rebind timer will eventually time-out if renew does not work */
+ dhcp_renew(netif);
+ /* did not get response to rebind request? */
+ } else if (dhcp->state == DHCP_REBINDING) {
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_timeout(): REBINDING, DHCP request timed out\n"));
+ if (dhcp->tries <= 8) {
+ dhcp_rebind(netif);
+ } else {
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_timeout(): RELEASING, DISCOVERING\n"));
+ dhcp_release(netif);
+ dhcp_discover(netif);
+ }
+ } else if (dhcp->state == DHCP_REBOOTING) {
+ if (dhcp->tries < REBOOT_TRIES) {
+ dhcp_reboot(netif);
+ } else {
+ dhcp_discover(netif);
+ }
+ }
+}
+
+/**
+ * The renewal period has timed out.
+ *
+ * @param netif the netif under DHCP control
+ */
+static void
+dhcp_t1_timeout(struct netif *netif)
+{
+ struct dhcp *dhcp = netif->dhcp;
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_STATE, ("dhcp_t1_timeout()\n"));
+ if ((dhcp->state == DHCP_REQUESTING) || (dhcp->state == DHCP_BOUND) ||
+ (dhcp->state == DHCP_RENEWING)) {
+ /* just retry to renew - note that the rebind timer (t2) will
+ * eventually time-out if renew tries fail. */
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE,
+ ("dhcp_t1_timeout(): must renew\n"));
+ /* This slightly different to RFC2131: DHCPREQUEST will be sent from state
+ DHCP_RENEWING, not DHCP_BOUND */
+ dhcp_renew(netif);
+ }
+}
+
+/**
+ * The rebind period has timed out.
+ *
+ * @param netif the netif under DHCP control
+ */
+static void
+dhcp_t2_timeout(struct netif *netif)
+{
+ struct dhcp *dhcp = netif->dhcp;
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_t2_timeout()\n"));
+ if ((dhcp->state == DHCP_REQUESTING) || (dhcp->state == DHCP_BOUND) ||
+ (dhcp->state == DHCP_RENEWING)) {
+ /* just retry to rebind */
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE,
+ ("dhcp_t2_timeout(): must rebind\n"));
+ /* This slightly different to RFC2131: DHCPREQUEST will be sent from state
+ DHCP_REBINDING, not DHCP_BOUND */
+ dhcp_rebind(netif);
+ }
+}
+
+/**
+ * Handle a DHCP ACK packet
+ *
+ * @param netif the netif under DHCP control
+ */
+static void
+dhcp_handle_ack(struct netif *netif)
+{
+ struct dhcp *dhcp = netif->dhcp;
+#if LWIP_DNS
+ u8_t n;
+#endif /* LWIP_DNS */
+
+ /* clear options we might not get from the ACK */
+ ip_addr_set_zero(&dhcp->offered_sn_mask);
+ ip_addr_set_zero(&dhcp->offered_gw_addr);
+#if LWIP_DHCP_BOOTP_FILE
+ ip_addr_set_zero(&dhcp->offered_si_addr);
+#endif /* LWIP_DHCP_BOOTP_FILE */
+
+ /* lease time given? */
+ if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_LEASE_TIME)) {
+ /* remember offered lease time */
+ dhcp->offered_t0_lease = dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_LEASE_TIME);
+ }
+ /* renewal period given? */
+ if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_T1)) {
+ /* remember given renewal period */
+ dhcp->offered_t1_renew = dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_T1);
+ } else {
+ /* calculate safe periods for renewal */
+ dhcp->offered_t1_renew = dhcp->offered_t0_lease / 2;
+ }
+
+ /* renewal period given? */
+ if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_T2)) {
+ /* remember given rebind period */
+ dhcp->offered_t2_rebind = dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_T2);
+ } else {
+ /* calculate safe periods for rebinding */
+ dhcp->offered_t2_rebind = dhcp->offered_t0_lease;
+ }
+
+ /* (y)our internet address */
+ ip_addr_copy(dhcp->offered_ip_addr, dhcp->msg_in->yiaddr);
+
+#if LWIP_DHCP_BOOTP_FILE
+ /* copy boot server address,
+ boot file name copied in dhcp_parse_reply if not overloaded */
+ ip_addr_copy(dhcp->offered_si_addr, dhcp->msg_in->siaddr);
+#endif /* LWIP_DHCP_BOOTP_FILE */
+
+ /* subnet mask given? */
+ if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_SUBNET_MASK)) {
+ /* remember given subnet mask */
+ ip4_addr_set_u32(&dhcp->offered_sn_mask, htonl(dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_SUBNET_MASK)));
+ dhcp->subnet_mask_given = 1;
+ } else {
+ dhcp->subnet_mask_given = 0;
+ }
+
+ /* gateway router */
+ if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_ROUTER)) {
+ ip4_addr_set_u32(&dhcp->offered_gw_addr, htonl(dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_ROUTER)));
+ }
+
+#if LWIP_DNS
+ /* DNS servers */
+ for(n = 0; (n < DNS_MAX_SERVERS) && dhcp_option_given(dhcp, DHCP_OPTION_IDX_DNS_SERVER + n); n++) {
+ ip_addr_t dns_addr;
+ ip4_addr_set_u32(&dns_addr, htonl(dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_DNS_SERVER + n)));
+ dns_setserver(n, &dns_addr);
+ }
+#endif /* LWIP_DNS */
+}
+
+/** Set a statically allocated struct dhcp to work with.
+ * Using this prevents dhcp_start to allocate it using mem_malloc.
+ *
+ * @param netif the netif for which to set the struct dhcp
+ * @param dhcp (uninitialised) dhcp struct allocated by the application
+ */
+void
+dhcp_set_struct(struct netif *netif, struct dhcp *dhcp)
+{
+ LWIP_ASSERT("netif != NULL", netif != NULL);
+ LWIP_ASSERT("dhcp != NULL", dhcp != NULL);
+ LWIP_ASSERT("netif already has a struct dhcp set", netif->dhcp == NULL);
+
+ /* clear data structure */
+ memset(dhcp, 0, sizeof(struct dhcp));
+ /* dhcp_set_state(&dhcp, DHCP_OFF); */
+ netif->dhcp = dhcp;
+}
+
+/** Removes a struct dhcp from a netif.
+ *
+ * ATTENTION: Only use this when not using dhcp_set_struct() to allocate the
+ * struct dhcp since the memory is passed back to the heap.
+ *
+ * @param netif the netif from which to remove the struct dhcp
+ */
+void dhcp_cleanup(struct netif *netif)
+{
+ LWIP_ASSERT("netif != NULL", netif != NULL);
+
+ if (netif->dhcp != NULL) {
+ mem_free(netif->dhcp);
+ netif->dhcp = NULL;
+ }
+}
+
+/**
+ * Start DHCP negotiation for a network interface.
+ *
+ * If no DHCP client instance was attached to this interface,
+ * a new client is created first. If a DHCP client instance
+ * was already present, it restarts negotiation.
+ *
+ * @param netif The lwIP network interface
+ * @return lwIP error code
+ * - ERR_OK - No error
+ * - ERR_MEM - Out of memory
+ */
+err_t
+dhcp_start(struct netif *netif)
+{
+ struct dhcp *dhcp;
+ err_t result = ERR_OK;
+
+ LWIP_ERROR("netif != NULL", (netif != NULL), return ERR_ARG;);
+ dhcp = netif->dhcp;
+ 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));
+ /* Remove the flag that says this netif is handled by DHCP,
+ it is set when we succeeded starting. */
+ netif->flags &= ~NETIF_FLAG_DHCP;
+
+ /* check hwtype of the netif */
+ if ((netif->flags & NETIF_FLAG_ETHARP) == 0) {
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_start(): No ETHARP netif\n"));
+ return ERR_ARG;
+ }
+
+ /* check MTU of the netif */
+ if (netif->mtu < DHCP_MAX_MSG_LEN_MIN_REQUIRED) {
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_start(): Cannot use this netif with DHCP: MTU is too small\n"));
+ return ERR_MEM;
+ }
+
+ /* no DHCP client attached yet? */
+ if (dhcp == NULL) {
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_start(): starting new DHCP client\n"));
+ dhcp = (struct dhcp *)mem_malloc(sizeof(struct dhcp));
+ if (dhcp == NULL) {
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_start(): could not allocate dhcp\n"));
+ return ERR_MEM;
+ }
+ /* store this dhcp client in the netif */
+ netif->dhcp = dhcp;
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_start(): allocated dhcp"));
+ /* already has DHCP client attached */
+ } else {
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_start(): restarting DHCP configuration\n"));
+ if (dhcp->pcb != NULL) {
+ udp_remove(dhcp->pcb);
+ }
+ LWIP_ASSERT("pbuf p_out wasn't freed", dhcp->p_out == NULL);
+ LWIP_ASSERT("reply wasn't freed", dhcp->msg_in == NULL );
+ }
+
+ /* clear data structure */
+ memset(dhcp, 0, sizeof(struct dhcp));
+ /* dhcp_set_state(&dhcp, DHCP_OFF); */
+ /* allocate UDP PCB */
+ dhcp->pcb = udp_new();
+ if (dhcp->pcb == NULL) {
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_start(): could not obtain pcb\n"));
+ return ERR_MEM;
+ }
+ ip_set_option(dhcp->pcb, SOF_BROADCAST);
+ /* set up local and remote port for the pcb */
+ udp_bind(dhcp->pcb, IP_ADDR_ANY, DHCP_CLIENT_PORT);
+ udp_connect(dhcp->pcb, IP_ADDR_ANY, DHCP_SERVER_PORT);
+ /* set up the recv callback and argument */
+ udp_recv(dhcp->pcb, dhcp_recv, netif);
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_start(): starting DHCP configuration\n"));
+ /* (re)start the DHCP negotiation */
+ result = dhcp_discover(netif);
+ if (result != ERR_OK) {
+ /* free resources allocated above */
+ dhcp_stop(netif);
+ return ERR_MEM;
+ }
+ /* Set the flag that says this netif is handled by DHCP. */
+ netif->flags |= NETIF_FLAG_DHCP;
+ return result;
+}
+
+/**
+ * Inform a DHCP server of our manual configuration.
+ *
+ * This informs DHCP servers of our fixed IP address configuration
+ * by sending an INFORM message. It does not involve DHCP address
+ * configuration, it is just here to be nice to the network.
+ *
+ * @param netif The lwIP network interface
+ */
+void
+dhcp_inform(struct netif *netif)
+{
+ struct dhcp dhcp;
+ err_t result = ERR_OK;
+ struct udp_pcb *pcb;
+
+ LWIP_ERROR("netif != NULL", (netif != NULL), return;);
+
+ memset(&dhcp, 0, sizeof(struct dhcp));
+ dhcp_set_state(&dhcp, DHCP_INFORM);
+
+ if ((netif->dhcp != NULL) && (netif->dhcp->pcb != NULL)) {
+ /* re-use existing pcb */
+ pcb = netif->dhcp->pcb;
+ } else {
+ pcb = udp_new();
+ if (pcb == NULL) {
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("dhcp_inform(): could not obtain pcb"));
+ return;
+ }
+ dhcp.pcb = pcb;
+ ip_set_option(dhcp.pcb, SOF_BROADCAST);
+ udp_bind(dhcp.pcb, IP_ADDR_ANY, DHCP_CLIENT_PORT);
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_inform(): created new udp pcb\n"));
+ }
+ /* create and initialize the DHCP message header */
+ result = dhcp_create_msg(netif, &dhcp, DHCP_INFORM);
+ if (result == ERR_OK) {
+ dhcp_option(&dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
+ dhcp_option_short(&dhcp, DHCP_MAX_MSG_LEN(netif));
+
+ dhcp_option_trailer(&dhcp);
+
+ pbuf_realloc(dhcp.p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp.options_out_len);
+
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_inform: INFORMING\n"));
+ udp_sendto_if(pcb, dhcp.p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
+ dhcp_delete_msg(&dhcp);
+ } else {
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("dhcp_inform: could not allocate DHCP request\n"));
+ }
+
+ if (dhcp.pcb != NULL) {
+ /* otherwise, the existing pcb was used */
+ udp_remove(dhcp.pcb);
+ }
+}
+
+/** Handle a possible change in the network configuration.
+ *
+ * This enters the REBOOTING state to verify that the currently bound
+ * address is still valid.
+ */
+void
+dhcp_network_changed(struct netif *netif)
+{
+ struct dhcp *dhcp = netif->dhcp;
+ if (!dhcp)
+ return;
+ switch (dhcp->state) {
+ case DHCP_REBINDING:
+ case DHCP_RENEWING:
+ case DHCP_BOUND:
+ case DHCP_REBOOTING:
+ netif_set_down(netif);
+ dhcp->tries = 0;
+ dhcp_reboot(netif);
+ break;
+ case DHCP_OFF:
+ /* stay off */
+ break;
+ default:
+ dhcp->tries = 0;
+#if LWIP_DHCP_AUTOIP_COOP
+ if(dhcp->autoip_coop_state == DHCP_AUTOIP_COOP_STATE_ON) {
+ autoip_stop(netif);
+ dhcp->autoip_coop_state = DHCP_AUTOIP_COOP_STATE_OFF;
+ }
+#endif /* LWIP_DHCP_AUTOIP_COOP */
+ dhcp_discover(netif);
+ break;
+ }
+}
+
+#if DHCP_DOES_ARP_CHECK
+/**
+ * Match an ARP reply with the offered IP address.
+ *
+ * @param netif the network interface on which the reply was received
+ * @param addr The IP address we received a reply from
+ */
+void dhcp_arp_reply(struct netif *netif, ip_addr_t *addr)
+{
+ LWIP_ERROR("netif != NULL", (netif != NULL), return;);
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_arp_reply()\n"));
+ /* is a DHCP client doing an ARP check? */
+ if ((netif->dhcp != NULL) && (netif->dhcp->state == DHCP_CHECKING)) {
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_arp_reply(): CHECKING, arp reply for 0x%08"X32_F"\n",
+ ip4_addr_get_u32(addr)));
+ /* did a host respond with the address we
+ were offered by the DHCP server? */
+ if (ip_addr_cmp(addr, &netif->dhcp->offered_ip_addr)) {
+ /* we will not accept the offered address */
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE | LWIP_DBG_LEVEL_WARNING,
+ ("dhcp_arp_reply(): arp reply matched with offered address, declining\n"));
+ dhcp_decline(netif);
+ }
+ }
+}
+
+/**
+ * Decline an offered lease.
+ *
+ * Tell the DHCP server we do not accept the offered address.
+ * One reason to decline the lease is when we find out the address
+ * is already in use by another host (through ARP).
+ *
+ * @param netif the netif under DHCP control
+ */
+static err_t
+dhcp_decline(struct netif *netif)
+{
+ struct dhcp *dhcp = netif->dhcp;
+ err_t result = ERR_OK;
+ u16_t msecs;
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_decline()\n"));
+ dhcp_set_state(dhcp, DHCP_BACKING_OFF);
+ /* create and initialize the DHCP message header */
+ result = dhcp_create_msg(netif, dhcp, DHCP_DECLINE);
+ if (result == ERR_OK) {
+ dhcp_option(dhcp, DHCP_OPTION_REQUESTED_IP, 4);
+ dhcp_option_long(dhcp, ntohl(ip4_addr_get_u32(&dhcp->offered_ip_addr)));
+
+ dhcp_option_trailer(dhcp);
+ /* resize pbuf to reflect true size of options */
+ pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
+
+ /* per section 4.4.4, broadcast DECLINE messages */
+ udp_sendto_if(dhcp->pcb, dhcp->p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
+ dhcp_delete_msg(dhcp);
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_decline: BACKING OFF\n"));
+ } else {
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS,
+ ("dhcp_decline: could not allocate DHCP request\n"));
+ }
+ dhcp->tries++;
+ msecs = 10*1000;
+ dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_decline(): set request timeout %"U16_F" msecs\n", msecs));
+ return result;
+}
+#endif /* DHCP_DOES_ARP_CHECK */
+
+
+/**
+ * Start the DHCP process, discover a DHCP server.
+ *
+ * @param netif the netif under DHCP control
+ */
+static err_t
+dhcp_discover(struct netif *netif)
+{
+ struct dhcp *dhcp = netif->dhcp;
+ err_t result = ERR_OK;
+ u16_t msecs;
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_discover()\n"));
+ ip_addr_set_any(&dhcp->offered_ip_addr);
+ dhcp_set_state(dhcp, DHCP_SELECTING);
+ /* create and initialize the DHCP message header */
+ result = dhcp_create_msg(netif, dhcp, DHCP_DISCOVER);
+ if (result == ERR_OK) {
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_discover: making request\n"));
+
+ dhcp_option(dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
+ dhcp_option_short(dhcp, DHCP_MAX_MSG_LEN(netif));
+
+ dhcp_option(dhcp, DHCP_OPTION_PARAMETER_REQUEST_LIST, 4/*num options*/);
+ dhcp_option_byte(dhcp, DHCP_OPTION_SUBNET_MASK);
+ dhcp_option_byte(dhcp, DHCP_OPTION_ROUTER);
+ dhcp_option_byte(dhcp, DHCP_OPTION_BROADCAST);
+ dhcp_option_byte(dhcp, DHCP_OPTION_DNS_SERVER);
+
+ dhcp_option_trailer(dhcp);
+
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_discover: realloc()ing\n"));
+ pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
+
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_discover: sendto(DISCOVER, IP_ADDR_BROADCAST, DHCP_SERVER_PORT)\n"));
+ udp_sendto_if(dhcp->pcb, dhcp->p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_discover: deleting()ing\n"));
+ dhcp_delete_msg(dhcp);
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_discover: SELECTING\n"));
+ } else {
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("dhcp_discover: could not allocate DHCP request\n"));
+ }
+ dhcp->tries++;
+#if LWIP_DHCP_AUTOIP_COOP
+ if(dhcp->tries >= LWIP_DHCP_AUTOIP_COOP_TRIES && dhcp->autoip_coop_state == DHCP_AUTOIP_COOP_STATE_OFF) {
+ dhcp->autoip_coop_state = DHCP_AUTOIP_COOP_STATE_ON;
+ autoip_start(netif);
+ }
+#endif /* LWIP_DHCP_AUTOIP_COOP */
+ msecs = (dhcp->tries < 6 ? 1 << dhcp->tries : 60) * 1000;
+ dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_discover(): set request timeout %"U16_F" msecs\n", msecs));
+ return result;
+}
+
+
+/**
+ * Bind the interface to the offered IP address.
+ *
+ * @param netif network interface to bind to the offered address
+ */
+static void
+dhcp_bind(struct netif *netif)
+{
+ u32_t timeout;
+ struct dhcp *dhcp;
+ ip_addr_t sn_mask, gw_addr;
+ LWIP_ERROR("dhcp_bind: netif != NULL", (netif != NULL), return;);
+ dhcp = netif->dhcp;
+ LWIP_ERROR("dhcp_bind: dhcp != NULL", (dhcp != NULL), return;);
+ 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));
+
+ /* temporary DHCP lease? */
+ if (dhcp->offered_t1_renew != 0xffffffffUL) {
+ /* set renewal period timer */
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_bind(): t1 renewal timer %"U32_F" secs\n", dhcp->offered_t1_renew));
+ timeout = (dhcp->offered_t1_renew + DHCP_COARSE_TIMER_SECS / 2) / DHCP_COARSE_TIMER_SECS;
+ if(timeout > 0xffff) {
+ timeout = 0xffff;
+ }
+ dhcp->t1_timeout = (u16_t)timeout;
+ if (dhcp->t1_timeout == 0) {
+ dhcp->t1_timeout = 1;
+ }
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_bind(): set request timeout %"U32_F" msecs\n", dhcp->offered_t1_renew*1000));
+ }
+ /* set renewal period timer */
+ if (dhcp->offered_t2_rebind != 0xffffffffUL) {
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_bind(): t2 rebind timer %"U32_F" secs\n", dhcp->offered_t2_rebind));
+ timeout = (dhcp->offered_t2_rebind + DHCP_COARSE_TIMER_SECS / 2) / DHCP_COARSE_TIMER_SECS;
+ if(timeout > 0xffff) {
+ timeout = 0xffff;
+ }
+ dhcp->t2_timeout = (u16_t)timeout;
+ if (dhcp->t2_timeout == 0) {
+ dhcp->t2_timeout = 1;
+ }
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_bind(): set request timeout %"U32_F" msecs\n", dhcp->offered_t2_rebind*1000));
+ }
+
+ /* If we have sub 1 minute lease, t2 and t1 will kick in at the same time. */
+ if ((dhcp->t1_timeout >= dhcp->t2_timeout) && (dhcp->t2_timeout > 0)) {
+ dhcp->t1_timeout = 0;
+ }
+
+ if (dhcp->subnet_mask_given) {
+ /* copy offered network mask */
+ ip_addr_copy(sn_mask, dhcp->offered_sn_mask);
+ } else {
+ /* subnet mask not given, choose a safe subnet mask given the network class */
+ u8_t first_octet = ip4_addr1(&dhcp->offered_ip_addr);
+ if (first_octet <= 127) {
+ ip4_addr_set_u32(&sn_mask, PP_HTONL(0xff000000UL));
+ } else if (first_octet >= 192) {
+ ip4_addr_set_u32(&sn_mask, PP_HTONL(0xffffff00UL));
+ } else {
+ ip4_addr_set_u32(&sn_mask, PP_HTONL(0xffff0000UL));
+ }
+ }
+
+ ip_addr_copy(gw_addr, dhcp->offered_gw_addr);
+ /* gateway address not given? */
+ if (ip_addr_isany(&gw_addr)) {
+ /* copy network address */
+ ip_addr_get_network(&gw_addr, &dhcp->offered_ip_addr, &sn_mask);
+ /* use first host address on network as gateway */
+ ip4_addr_set_u32(&gw_addr, ip4_addr_get_u32(&gw_addr) | PP_HTONL(0x00000001UL));
+ }
+
+#if LWIP_DHCP_AUTOIP_COOP
+ if(dhcp->autoip_coop_state == DHCP_AUTOIP_COOP_STATE_ON) {
+ autoip_stop(netif);
+ dhcp->autoip_coop_state = DHCP_AUTOIP_COOP_STATE_OFF;
+ }
+#endif /* LWIP_DHCP_AUTOIP_COOP */
+
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_STATE, ("dhcp_bind(): IP: 0x%08"X32_F"\n",
+ ip4_addr_get_u32(&dhcp->offered_ip_addr)));
+ netif_set_ipaddr(netif, &dhcp->offered_ip_addr);
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_STATE, ("dhcp_bind(): SN: 0x%08"X32_F"\n",
+ ip4_addr_get_u32(&sn_mask)));
+ netif_set_netmask(netif, &sn_mask);
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_STATE, ("dhcp_bind(): GW: 0x%08"X32_F"\n",
+ ip4_addr_get_u32(&gw_addr)));
+ netif_set_gw(netif, &gw_addr);
+ /* bring the interface up */
+ netif_set_up(netif);
+ /* netif is now bound to DHCP leased address */
+ dhcp_set_state(dhcp, DHCP_BOUND);
+}
+
+/**
+ * Renew an existing DHCP lease at the involved DHCP server.
+ *
+ * @param netif network interface which must renew its lease
+ */
+err_t
+dhcp_renew(struct netif *netif)
+{
+ struct dhcp *dhcp = netif->dhcp;
+ err_t result;
+ u16_t msecs;
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_renew()\n"));
+ dhcp_set_state(dhcp, DHCP_RENEWING);
+
+ /* create and initialize the DHCP message header */
+ result = dhcp_create_msg(netif, dhcp, DHCP_REQUEST);
+ if (result == ERR_OK) {
+ dhcp_option(dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
+ dhcp_option_short(dhcp, DHCP_MAX_MSG_LEN(netif));
+
+#if 0
+ dhcp_option(dhcp, DHCP_OPTION_REQUESTED_IP, 4);
+ dhcp_option_long(dhcp, ntohl(dhcp->offered_ip_addr.addr));
+#endif
+
+#if 0
+ dhcp_option(dhcp, DHCP_OPTION_SERVER_ID, 4);
+ dhcp_option_long(dhcp, ntohl(dhcp->server_ip_addr.addr));
+#endif
+
+#if LWIP_NETIF_HOSTNAME
+ dhcp_option_hostname(dhcp, netif);
+#endif /* LWIP_NETIF_HOSTNAME */
+
+ /* append DHCP message trailer */
+ dhcp_option_trailer(dhcp);
+
+ pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
+
+ udp_sendto_if(dhcp->pcb, dhcp->p_out, &dhcp->server_ip_addr, DHCP_SERVER_PORT, netif);
+ dhcp_delete_msg(dhcp);
+
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_renew: RENEWING\n"));
+ } else {
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("dhcp_renew: could not allocate DHCP request\n"));
+ }
+ dhcp->tries++;
+ /* back-off on retries, but to a maximum of 20 seconds */
+ msecs = dhcp->tries < 10 ? dhcp->tries * 2000 : 20 * 1000;
+ dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_renew(): set request timeout %"U16_F" msecs\n", msecs));
+ return result;
+}
+
+/**
+ * Rebind with a DHCP server for an existing DHCP lease.
+ *
+ * @param netif network interface which must rebind with a DHCP server
+ */
+static err_t
+dhcp_rebind(struct netif *netif)
+{
+ struct dhcp *dhcp = netif->dhcp;
+ err_t result;
+ u16_t msecs;
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_rebind()\n"));
+ dhcp_set_state(dhcp, DHCP_REBINDING);
+
+ /* create and initialize the DHCP message header */
+ result = dhcp_create_msg(netif, dhcp, DHCP_REQUEST);
+ if (result == ERR_OK) {
+ dhcp_option(dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
+ dhcp_option_short(dhcp, DHCP_MAX_MSG_LEN(netif));
+
+#if LWIP_NETIF_HOSTNAME
+ dhcp_option_hostname(dhcp, netif);
+#endif /* LWIP_NETIF_HOSTNAME */
+
+#if 0
+ dhcp_option(dhcp, DHCP_OPTION_REQUESTED_IP, 4);
+ dhcp_option_long(dhcp, ntohl(dhcp->offered_ip_addr.addr));
+
+ dhcp_option(dhcp, DHCP_OPTION_SERVER_ID, 4);
+ dhcp_option_long(dhcp, ntohl(dhcp->server_ip_addr.addr));
+#endif
+
+ dhcp_option_trailer(dhcp);
+
+ pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
+
+ /* broadcast to server */
+ udp_sendto_if(dhcp->pcb, dhcp->p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
+ dhcp_delete_msg(dhcp);
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_rebind: REBINDING\n"));
+ } else {
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("dhcp_rebind: could not allocate DHCP request\n"));
+ }
+ dhcp->tries++;
+ msecs = dhcp->tries < 10 ? dhcp->tries * 1000 : 10 * 1000;
+ dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_rebind(): set request timeout %"U16_F" msecs\n", msecs));
+ return result;
+}
+
+/**
+ * Enter REBOOTING state to verify an existing lease
+ *
+ * @param netif network interface which must reboot
+ */
+static err_t
+dhcp_reboot(struct netif *netif)
+{
+ struct dhcp *dhcp = netif->dhcp;
+ err_t result;
+ u16_t msecs;
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_reboot()\n"));
+ dhcp_set_state(dhcp, DHCP_REBOOTING);
+
+ /* create and initialize the DHCP message header */
+ result = dhcp_create_msg(netif, dhcp, DHCP_REQUEST);
+ if (result == ERR_OK) {
+ dhcp_option(dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
+ dhcp_option_short(dhcp, 576);
+
+ dhcp_option(dhcp, DHCP_OPTION_REQUESTED_IP, 4);
+ dhcp_option_long(dhcp, ntohl(ip4_addr_get_u32(&dhcp->offered_ip_addr)));
+
+ dhcp_option_trailer(dhcp);
+
+ pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
+
+ /* broadcast to server */
+ udp_sendto_if(dhcp->pcb, dhcp->p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
+ dhcp_delete_msg(dhcp);
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_reboot: REBOOTING\n"));
+ } else {
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("dhcp_reboot: could not allocate DHCP request\n"));
+ }
+ dhcp->tries++;
+ msecs = dhcp->tries < 10 ? dhcp->tries * 1000 : 10 * 1000;
+ dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_reboot(): set request timeout %"U16_F" msecs\n", msecs));
+ return result;
+}
+
+
+/**
+ * Release a DHCP lease.
+ *
+ * @param netif network interface which must release its lease
+ */
+err_t
+dhcp_release(struct netif *netif)
+{
+ struct dhcp *dhcp = netif->dhcp;
+ err_t result;
+ u16_t msecs;
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_release()\n"));
+ if (dhcp == NULL) {
+ return ERR_ARG;
+ }
+
+ /* idle DHCP client */
+ dhcp_set_state(dhcp, DHCP_OFF);
+ /* clean old DHCP offer */
+ ip_addr_set_zero(&dhcp->server_ip_addr);
+ ip_addr_set_zero(&dhcp->offered_ip_addr);
+ ip_addr_set_zero(&dhcp->offered_sn_mask);
+ ip_addr_set_zero(&dhcp->offered_gw_addr);
+#if LWIP_DHCP_BOOTP_FILE
+ ip_addr_set_zero(&dhcp->offered_si_addr);
+#endif /* LWIP_DHCP_BOOTP_FILE */
+ dhcp->offered_t0_lease = dhcp->offered_t1_renew = dhcp->offered_t2_rebind = 0;
+
+ /* create and initialize the DHCP message header */
+ result = dhcp_create_msg(netif, dhcp, DHCP_RELEASE);
+ if (result == ERR_OK) {
+ dhcp_option_trailer(dhcp);
+
+ pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
+
+ udp_sendto_if(dhcp->pcb, dhcp->p_out, &dhcp->server_ip_addr, DHCP_SERVER_PORT, netif);
+ dhcp_delete_msg(dhcp);
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_release: RELEASED, DHCP_OFF\n"));
+ } else {
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("dhcp_release: could not allocate DHCP request\n"));
+ }
+ dhcp->tries++;
+ msecs = dhcp->tries < 10 ? dhcp->tries * 1000 : 10 * 1000;
+ dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_release(): set request timeout %"U16_F" msecs\n", msecs));
+ /* bring the interface down */
+ netif_set_down(netif);
+ /* remove IP address from interface */
+ netif_set_ipaddr(netif, IP_ADDR_ANY);
+ netif_set_gw(netif, IP_ADDR_ANY);
+ netif_set_netmask(netif, IP_ADDR_ANY);
+
+ return result;
+}
+
+/**
+ * Remove the DHCP client from the interface.
+ *
+ * @param netif The network interface to stop DHCP on
+ */
+void
+dhcp_stop(struct netif *netif)
+{
+ struct dhcp *dhcp;
+ LWIP_ERROR("dhcp_stop: netif != NULL", (netif != NULL), return;);
+ dhcp = netif->dhcp;
+ /* Remove the flag that says this netif is handled by DHCP. */
+ netif->flags &= ~NETIF_FLAG_DHCP;
+
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_stop()\n"));
+ /* netif is DHCP configured? */
+ if (dhcp != NULL) {
+#if LWIP_DHCP_AUTOIP_COOP
+ if(dhcp->autoip_coop_state == DHCP_AUTOIP_COOP_STATE_ON) {
+ autoip_stop(netif);
+ dhcp->autoip_coop_state = DHCP_AUTOIP_COOP_STATE_OFF;
+ }
+#endif /* LWIP_DHCP_AUTOIP_COOP */
+
+ if (dhcp->pcb != NULL) {
+ udp_remove(dhcp->pcb);
+ dhcp->pcb = NULL;
+ }
+ LWIP_ASSERT("reply wasn't freed", dhcp->msg_in == NULL);
+ dhcp_set_state(dhcp, DHCP_OFF);
+ }
+}
+
+/*
+ * Set the DHCP state of a DHCP client.
+ *
+ * If the state changed, reset the number of tries.
+ */
+static void
+dhcp_set_state(struct dhcp *dhcp, u8_t new_state)
+{
+ if (new_state != dhcp->state) {
+ dhcp->state = new_state;
+ dhcp->tries = 0;
+ dhcp->request_timeout = 0;
+ }
+}
+
+/*
+ * Concatenate an option type and length field to the outgoing
+ * DHCP message.
+ *
+ */
+static void
+dhcp_option(struct dhcp *dhcp, u8_t option_type, u8_t option_len)
+{
+ LWIP_ASSERT("dhcp_option: dhcp->options_out_len + 2 + option_len <= DHCP_OPTIONS_LEN", dhcp->options_out_len + 2U + option_len <= DHCP_OPTIONS_LEN);
+ dhcp->msg_out->options[dhcp->options_out_len++] = option_type;
+ dhcp->msg_out->options[dhcp->options_out_len++] = option_len;
+}
+/*
+ * Concatenate a single byte to the outgoing DHCP message.
+ *
+ */
+static void
+dhcp_option_byte(struct dhcp *dhcp, u8_t value)
+{
+ LWIP_ASSERT("dhcp_option_byte: dhcp->options_out_len < DHCP_OPTIONS_LEN", dhcp->options_out_len < DHCP_OPTIONS_LEN);
+ dhcp->msg_out->options[dhcp->options_out_len++] = value;
+}
+
+static void
+dhcp_option_short(struct dhcp *dhcp, u16_t value)
+{
+ LWIP_ASSERT("dhcp_option_short: dhcp->options_out_len + 2 <= DHCP_OPTIONS_LEN", dhcp->options_out_len + 2U <= DHCP_OPTIONS_LEN);
+ dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t)((value & 0xff00U) >> 8);
+ dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t) (value & 0x00ffU);
+}
+
+static void
+dhcp_option_long(struct dhcp *dhcp, u32_t value)
+{
+ LWIP_ASSERT("dhcp_option_long: dhcp->options_out_len + 4 <= DHCP_OPTIONS_LEN", dhcp->options_out_len + 4U <= DHCP_OPTIONS_LEN);
+ dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t)((value & 0xff000000UL) >> 24);
+ dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t)((value & 0x00ff0000UL) >> 16);
+ dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t)((value & 0x0000ff00UL) >> 8);
+ dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t)((value & 0x000000ffUL));
+}
+
+#if LWIP_NETIF_HOSTNAME
+static void
+dhcp_option_hostname(struct dhcp *dhcp, struct netif *netif)
+{
+ if (netif->hostname != NULL) {
+ size_t namelen = strlen(netif->hostname);
+ if (namelen > 0) {
+ u8_t len;
+ const char *p = netif->hostname;
+ /* Shrink len to available bytes (need 2 bytes for OPTION_HOSTNAME
+ and 1 byte for trailer) */
+ size_t available = DHCP_OPTIONS_LEN - dhcp->options_out_len - 3;
+ LWIP_ASSERT("DHCP: hostname is too long!", namelen <= available);
+ len = LWIP_MIN(namelen, available);
+ dhcp_option(dhcp, DHCP_OPTION_HOSTNAME, len);
+ while (len--) {
+ dhcp_option_byte(dhcp, *p++);
+ }
+ }
+ }
+}
+#endif /* LWIP_NETIF_HOSTNAME */
+
+/**
+ * Extract the DHCP message and the DHCP options.
+ *
+ * Extract the DHCP message and the DHCP options, each into a contiguous
+ * piece of memory. As a DHCP message is variable sized by its options,
+ * and also allows overriding some fields for options, the easy approach
+ * is to first unfold the options into a conitguous piece of memory, and
+ * use that further on.
+ *
+ */
+static err_t
+dhcp_parse_reply(struct dhcp *dhcp, struct pbuf *p)
+{
+ u8_t *options;
+ u16_t offset;
+ u16_t offset_max;
+ u16_t options_idx;
+ u16_t options_idx_max;
+ struct pbuf *q;
+ int parse_file_as_options = 0;
+ int parse_sname_as_options = 0;
+
+ /* clear received options */
+ dhcp_clear_all_options(dhcp);
+ /* check that beginning of dhcp_msg (up to and including chaddr) is in first pbuf */
+ if (p->len < DHCP_SNAME_OFS) {
+ return ERR_BUF;
+ }
+ dhcp->msg_in = (struct dhcp_msg *)p->payload;
+#if LWIP_DHCP_BOOTP_FILE
+ /* clear boot file name */
+ dhcp->boot_file_name[0] = 0;
+#endif /* LWIP_DHCP_BOOTP_FILE */
+
+ /* parse options */
+
+ /* start with options field */
+ options_idx = DHCP_OPTIONS_OFS;
+ /* parse options to the end of the received packet */
+ options_idx_max = p->tot_len;
+again:
+ q = p;
+ while((q != NULL) && (options_idx >= q->len)) {
+ options_idx -= q->len;
+ options_idx_max -= q->len;
+ q = q->next;
+ }
+ if (q == NULL) {
+ return ERR_BUF;
+ }
+ offset = options_idx;
+ offset_max = options_idx_max;
+ options = (u8_t*)q->payload;
+ /* at least 1 byte to read and no end marker, then at least 3 bytes to read? */
+ while((q != NULL) && (options[offset] != DHCP_OPTION_END) && (offset < offset_max)) {
+ u8_t op = options[offset];
+ u8_t len;
+ u8_t decode_len = 0;
+ int decode_idx = -1;
+ u16_t val_offset = offset + 2;
+ /* len byte might be in the next pbuf */
+ if (offset + 1 < q->len) {
+ len = options[offset + 1];
+ } else {
+ len = (q->next != NULL ? ((u8_t*)q->next->payload)[0] : 0);
+ }
+ /* LWIP_DEBUGF(DHCP_DEBUG, ("msg_offset=%"U16_F", q->len=%"U16_F, msg_offset, q->len)); */
+ decode_len = len;
+ switch(op) {
+ /* case(DHCP_OPTION_END): handled above */
+ case(DHCP_OPTION_PAD):
+ /* special option: no len encoded */
+ decode_len = len = 0;
+ /* will be increased below */
+ offset--;
+ break;
+ case(DHCP_OPTION_SUBNET_MASK):
+ LWIP_ERROR("len == 4", len == 4, return ERR_VAL;);
+ decode_idx = DHCP_OPTION_IDX_SUBNET_MASK;
+ break;
+ case(DHCP_OPTION_ROUTER):
+ decode_len = 4; /* only copy the first given router */
+ LWIP_ERROR("len >= decode_len", len >= decode_len, return ERR_VAL;);
+ decode_idx = DHCP_OPTION_IDX_ROUTER;
+ break;
+ case(DHCP_OPTION_DNS_SERVER):
+ /* special case: there might be more than one server */
+ LWIP_ERROR("len % 4 == 0", len % 4 == 0, return ERR_VAL;);
+ /* limit number of DNS servers */
+ decode_len = LWIP_MIN(len, 4 * DNS_MAX_SERVERS);
+ LWIP_ERROR("len >= decode_len", len >= decode_len, return ERR_VAL;);
+ decode_idx = DHCP_OPTION_IDX_DNS_SERVER;
+ break;
+ case(DHCP_OPTION_LEASE_TIME):
+ LWIP_ERROR("len == 4", len == 4, return ERR_VAL;);
+ decode_idx = DHCP_OPTION_IDX_LEASE_TIME;
+ break;
+ case(DHCP_OPTION_OVERLOAD):
+ LWIP_ERROR("len == 1", len == 1, return ERR_VAL;);
+ decode_idx = DHCP_OPTION_IDX_OVERLOAD;
+ break;
+ case(DHCP_OPTION_MESSAGE_TYPE):
+ LWIP_ERROR("len == 1", len == 1, return ERR_VAL;);
+ decode_idx = DHCP_OPTION_IDX_MSG_TYPE;
+ break;
+ case(DHCP_OPTION_SERVER_ID):
+ LWIP_ERROR("len == 4", len == 4, return ERR_VAL;);
+ decode_idx = DHCP_OPTION_IDX_SERVER_ID;
+ break;
+ case(DHCP_OPTION_T1):
+ LWIP_ERROR("len == 4", len == 4, return ERR_VAL;);
+ decode_idx = DHCP_OPTION_IDX_T1;
+ break;
+ case(DHCP_OPTION_T2):
+ LWIP_ERROR("len == 4", len == 4, return ERR_VAL;);
+ decode_idx = DHCP_OPTION_IDX_T2;
+ break;
+ default:
+ decode_len = 0;
+ LWIP_DEBUGF(DHCP_DEBUG, ("skipping option %"U16_F" in options\n", op));
+ break;
+ }
+ offset += len + 2;
+ if (decode_len > 0) {
+ u32_t value = 0;
+ u16_t copy_len;
+decode_next:
+ LWIP_ASSERT("check decode_idx", decode_idx >= 0 && decode_idx < DHCP_OPTION_IDX_MAX);
+ if (!dhcp_option_given(dhcp, decode_idx)) {
+ copy_len = LWIP_MIN(decode_len, 4);
+ pbuf_copy_partial(q, &value, copy_len, val_offset);
+ if (decode_len > 4) {
+ /* decode more than one u32_t */
+ LWIP_ERROR("decode_len % 4 == 0", decode_len % 4 == 0, return ERR_VAL;);
+ dhcp_got_option(dhcp, decode_idx);
+ dhcp_set_option_value(dhcp, decode_idx, htonl(value));
+ decode_len -= 4;
+ val_offset += 4;
+ decode_idx++;
+ goto decode_next;
+ } else if (decode_len == 4) {
+ value = ntohl(value);
+ } else {
+ LWIP_ERROR("invalid decode_len", decode_len == 1, return ERR_VAL;);
+ value = ((u8_t*)&value)[0];
+ }
+ dhcp_got_option(dhcp, decode_idx);
+ dhcp_set_option_value(dhcp, decode_idx, value);
+ }
+ }
+ if (offset >= q->len) {
+ offset -= q->len;
+ offset_max -= q->len;
+ if ((offset < offset_max) && offset_max) {
+ q = q->next;
+ LWIP_ASSERT("next pbuf was null", q);
+ options = (u8_t*)q->payload;
+ } else {
+ /* We've run out of bytes, probably no end marker. Don't proceed. */
+ break;
+ }
+ }
+ }
+ /* is this an overloaded message? */
+ if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_OVERLOAD)) {
+ u32_t overload = dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_OVERLOAD);
+ dhcp_clear_option(dhcp, DHCP_OPTION_IDX_OVERLOAD);
+ if (overload == DHCP_OVERLOAD_FILE) {
+ parse_file_as_options = 1;
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("overloaded file field\n"));
+ } else if (overload == DHCP_OVERLOAD_SNAME) {
+ parse_sname_as_options = 1;
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("overloaded sname field\n"));
+ } else if (overload == DHCP_OVERLOAD_SNAME_FILE) {
+ parse_sname_as_options = 1;
+ parse_file_as_options = 1;
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("overloaded sname and file field\n"));
+ } else {
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("invalid overload option: %d\n", (int)overload));
+ }
+#if LWIP_DHCP_BOOTP_FILE
+ if (!parse_file_as_options) {
+ /* only do this for ACK messages */
+ if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_MSG_TYPE) &&
+ (dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_MSG_TYPE) == DHCP_ACK))
+ /* copy bootp file name, don't care for sname (server hostname) */
+ pbuf_copy_partial(p, dhcp->boot_file_name, DHCP_FILE_LEN-1, DHCP_FILE_OFS);
+ /* make sure the string is really NULL-terminated */
+ dhcp->boot_file_name[DHCP_FILE_LEN-1] = 0;
+ }
+#endif /* LWIP_DHCP_BOOTP_FILE */
+ }
+ if (parse_file_as_options) {
+ /* if both are overloaded, parse file first and then sname (RFC 2131 ch. 4.1) */
+ parse_file_as_options = 0;
+ options_idx = DHCP_FILE_OFS;
+ options_idx_max = DHCP_FILE_OFS + DHCP_FILE_LEN;
+ goto again;
+ } else if (parse_sname_as_options) {
+ parse_sname_as_options = 0;
+ options_idx = DHCP_SNAME_OFS;
+ options_idx_max = DHCP_SNAME_OFS + DHCP_SNAME_LEN;
+ goto again;
+ }
+ return ERR_OK;
+}
+
+/**
+ * If an incoming DHCP message is in response to us, then trigger the state machine
+ */
+static void
+dhcp_recv(void *arg, struct udp_pcb *pcb, struct pbuf *p, ip_addr_t *addr, u16_t port)
+{
+ struct netif *netif = (struct netif *)arg;
+ struct dhcp *dhcp = netif->dhcp;
+ struct dhcp_msg *reply_msg = (struct dhcp_msg *)p->payload;
+ u8_t msg_type;
+ u8_t i;
+ 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,
+ ip4_addr1_16(addr), ip4_addr2_16(addr), ip4_addr3_16(addr), ip4_addr4_16(addr), port));
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("pbuf->len = %"U16_F"\n", p->len));
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("pbuf->tot_len = %"U16_F"\n", p->tot_len));
+ /* prevent warnings about unused arguments */
+ LWIP_UNUSED_ARG(pcb);
+ LWIP_UNUSED_ARG(addr);
+ LWIP_UNUSED_ARG(port);
+
+ LWIP_ASSERT("reply wasn't freed", dhcp->msg_in == NULL);
+
+ if (p->len < DHCP_MIN_REPLY_LEN) {
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_WARNING, ("DHCP reply message or pbuf too short\n"));
+ goto free_pbuf_and_return;
+ }
+
+ if (reply_msg->op != DHCP_BOOTREPLY) {
+ 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));
+ goto free_pbuf_and_return;
+ }
+ /* iterate through hardware address and match against DHCP message */
+ for (i = 0; i < netif->hwaddr_len; i++) {
+ if (netif->hwaddr[i] != reply_msg->chaddr[i]) {
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_WARNING,
+ ("netif->hwaddr[%"U16_F"]==%02"X16_F" != reply_msg->chaddr[%"U16_F"]==%02"X16_F"\n",
+ (u16_t)i, (u16_t)netif->hwaddr[i], (u16_t)i, (u16_t)reply_msg->chaddr[i]));
+ goto free_pbuf_and_return;
+ }
+ }
+ /* match transaction ID against what we expected */
+ if (ntohl(reply_msg->xid) != dhcp->xid) {
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_WARNING,
+ ("transaction id mismatch reply_msg->xid(%"X32_F")!=dhcp->xid(%"X32_F")\n",ntohl(reply_msg->xid),dhcp->xid));
+ goto free_pbuf_and_return;
+ }
+ /* option fields could be unfold? */
+ if (dhcp_parse_reply(dhcp, p) != ERR_OK) {
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS,
+ ("problem unfolding DHCP message - too short on memory?\n"));
+ goto free_pbuf_and_return;
+ }
+
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("searching DHCP_OPTION_MESSAGE_TYPE\n"));
+ /* obtain pointer to DHCP message type */
+ if (!dhcp_option_given(dhcp, DHCP_OPTION_IDX_MSG_TYPE)) {
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_WARNING, ("DHCP_OPTION_MESSAGE_TYPE option not found\n"));
+ goto free_pbuf_and_return;
+ }
+
+ /* read DHCP message type */
+ msg_type = (u8_t)dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_MSG_TYPE);
+ /* message type is DHCP ACK? */
+ if (msg_type == DHCP_ACK) {
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("DHCP_ACK received\n"));
+ /* in requesting state? */
+ if (dhcp->state == DHCP_REQUESTING) {
+ dhcp_handle_ack(netif);
+#if DHCP_DOES_ARP_CHECK
+ /* check if the acknowledged lease address is already in use */
+ dhcp_check(netif);
+#else
+ /* bind interface to the acknowledged lease address */
+ dhcp_bind(netif);
+#endif
+ }
+ /* already bound to the given lease address? */
+ else if ((dhcp->state == DHCP_REBOOTING) || (dhcp->state == DHCP_REBINDING) || (dhcp->state == DHCP_RENEWING)) {
+ dhcp_bind(netif);
+ }
+ }
+ /* received a DHCP_NAK in appropriate state? */
+ else if ((msg_type == DHCP_NAK) &&
+ ((dhcp->state == DHCP_REBOOTING) || (dhcp->state == DHCP_REQUESTING) ||
+ (dhcp->state == DHCP_REBINDING) || (dhcp->state == DHCP_RENEWING ))) {
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("DHCP_NAK received\n"));
+ dhcp_handle_nak(netif);
+ }
+ /* received a DHCP_OFFER in DHCP_SELECTING state? */
+ else if ((msg_type == DHCP_OFFER) && (dhcp->state == DHCP_SELECTING)) {
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("DHCP_OFFER received in DHCP_SELECTING state\n"));
+ dhcp->request_timeout = 0;
+ /* remember offered lease */
+ dhcp_handle_offer(netif);
+ }
+free_pbuf_and_return:
+ dhcp->msg_in = NULL;
+ pbuf_free(p);
+}
+
+/**
+ * Create a DHCP request, fill in common headers
+ *
+ * @param netif the netif under DHCP control
+ * @param dhcp dhcp control struct
+ * @param message_type message type of the request
+ */
+static err_t
+dhcp_create_msg(struct netif *netif, struct dhcp *dhcp, u8_t message_type)
+{
+ u16_t i;
+#ifndef DHCP_GLOBAL_XID
+ /** default global transaction identifier starting value (easy to match
+ * with a packet analyser). We simply increment for each new request.
+ * Predefine DHCP_GLOBAL_XID to a better value or a function call to generate one
+ * at runtime, any supporting function prototypes can be defined in DHCP_GLOBAL_XID_HEADER */
+#if DHCP_CREATE_RAND_XID && defined(LWIP_RAND)
+ static u32_t xid;
+#else /* DHCP_CREATE_RAND_XID && defined(LWIP_RAND) */
+ static u32_t xid = 0xABCD0000;
+#endif /* DHCP_CREATE_RAND_XID && defined(LWIP_RAND) */
+#else
+ if (!xid_initialised) {
+ xid = DHCP_GLOBAL_XID;
+ xid_initialised = !xid_initialised;
+ }
+#endif
+ LWIP_ERROR("dhcp_create_msg: netif != NULL", (netif != NULL), return ERR_ARG;);
+ LWIP_ERROR("dhcp_create_msg: dhcp != NULL", (dhcp != NULL), return ERR_VAL;);
+ LWIP_ASSERT("dhcp_create_msg: dhcp->p_out == NULL", dhcp->p_out == NULL);
+ LWIP_ASSERT("dhcp_create_msg: dhcp->msg_out == NULL", dhcp->msg_out == NULL);
+ dhcp->p_out = pbuf_alloc(PBUF_TRANSPORT, sizeof(struct dhcp_msg), PBUF_RAM);
+ if (dhcp->p_out == NULL) {
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS,
+ ("dhcp_create_msg(): could not allocate pbuf\n"));
+ return ERR_MEM;
+ }
+ LWIP_ASSERT("dhcp_create_msg: check that first pbuf can hold struct dhcp_msg",
+ (dhcp->p_out->len >= sizeof(struct dhcp_msg)));
+
+ /* reuse transaction identifier in retransmissions */
+ if (dhcp->tries == 0) {
+#if DHCP_CREATE_RAND_XID && defined(LWIP_RAND)
+ xid = LWIP_RAND();
+#else /* DHCP_CREATE_RAND_XID && defined(LWIP_RAND) */
+ xid++;
+#endif /* DHCP_CREATE_RAND_XID && defined(LWIP_RAND) */
+ }
+ dhcp->xid = xid;
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE,
+ ("transaction id xid(%"X32_F")\n", xid));
+
+ dhcp->msg_out = (struct dhcp_msg *)dhcp->p_out->payload;
+
+ dhcp->msg_out->op = DHCP_BOOTREQUEST;
+ /* TODO: make link layer independent */
+ dhcp->msg_out->htype = DHCP_HTYPE_ETH;
+ dhcp->msg_out->hlen = netif->hwaddr_len;
+ dhcp->msg_out->hops = 0;
+ dhcp->msg_out->xid = htonl(dhcp->xid);
+ dhcp->msg_out->secs = 0;
+ /* we don't need the broadcast flag since we can receive unicast traffic
+ before being fully configured! */
+ dhcp->msg_out->flags = 0;
+ ip_addr_set_zero(&dhcp->msg_out->ciaddr);
+ /* set ciaddr to netif->ip_addr based on message_type and state */
+ if ((message_type == DHCP_INFORM) || (message_type == DHCP_DECLINE) ||
+ ((message_type == DHCP_REQUEST) && /* DHCP_BOUND not used for sending! */
+ ((dhcp->state==DHCP_RENEWING) || dhcp->state==DHCP_REBINDING))) {
+ ip_addr_copy(dhcp->msg_out->ciaddr, netif->ip_addr);
+ }
+ ip_addr_set_zero(&dhcp->msg_out->yiaddr);
+ ip_addr_set_zero(&dhcp->msg_out->siaddr);
+ ip_addr_set_zero(&dhcp->msg_out->giaddr);
+ for (i = 0; i < DHCP_CHADDR_LEN; i++) {
+ /* copy netif hardware address, pad with zeroes */
+ dhcp->msg_out->chaddr[i] = (i < netif->hwaddr_len && i < NETIF_MAX_HWADDR_LEN) ? netif->hwaddr[i] : 0/* pad byte*/;
+ }
+ for (i = 0; i < DHCP_SNAME_LEN; i++) {
+ dhcp->msg_out->sname[i] = 0;
+ }
+ for (i = 0; i < DHCP_FILE_LEN; i++) {
+ dhcp->msg_out->file[i] = 0;
+ }
+ dhcp->msg_out->cookie = PP_HTONL(DHCP_MAGIC_COOKIE);
+ dhcp->options_out_len = 0;
+ /* fill options field with an incrementing array (for debugging purposes) */
+ for (i = 0; i < DHCP_OPTIONS_LEN; i++) {
+ dhcp->msg_out->options[i] = (u8_t)i; /* for debugging only, no matter if truncated */
+ }
+ /* Add option MESSAGE_TYPE */
+ dhcp_option(dhcp, DHCP_OPTION_MESSAGE_TYPE, DHCP_OPTION_MESSAGE_TYPE_LEN);
+ dhcp_option_byte(dhcp, message_type);
+ return ERR_OK;
+}
+
+/**
+ * Free previously allocated memory used to send a DHCP request.
+ *
+ * @param dhcp the dhcp struct to free the request from
+ */
+static void
+dhcp_delete_msg(struct dhcp *dhcp)
+{
+ LWIP_ERROR("dhcp_delete_msg: dhcp != NULL", (dhcp != NULL), return;);
+ LWIP_ASSERT("dhcp_delete_msg: dhcp->p_out != NULL", dhcp->p_out != NULL);
+ LWIP_ASSERT("dhcp_delete_msg: dhcp->msg_out != NULL", dhcp->msg_out != NULL);
+ if (dhcp->p_out != NULL) {
+ pbuf_free(dhcp->p_out);
+ }
+ dhcp->p_out = NULL;
+ dhcp->msg_out = NULL;
+}
+
+/**
+ * Add a DHCP message trailer
+ *
+ * Adds the END option to the DHCP message, and if
+ * necessary, up to three padding bytes.
+ *
+ * @param dhcp DHCP state structure
+ */
+static void
+dhcp_option_trailer(struct dhcp *dhcp)
+{
+ LWIP_ERROR("dhcp_option_trailer: dhcp != NULL", (dhcp != NULL), return;);
+ LWIP_ASSERT("dhcp_option_trailer: dhcp->msg_out != NULL\n", dhcp->msg_out != NULL);
+ LWIP_ASSERT("dhcp_option_trailer: dhcp->options_out_len < DHCP_OPTIONS_LEN\n", dhcp->options_out_len < DHCP_OPTIONS_LEN);
+ dhcp->msg_out->options[dhcp->options_out_len++] = DHCP_OPTION_END;
+ /* packet is too small, or not 4 byte aligned? */
+ while (((dhcp->options_out_len < DHCP_MIN_OPTIONS_LEN) || (dhcp->options_out_len & 3)) &&
+ (dhcp->options_out_len < DHCP_OPTIONS_LEN)) {
+ /* add a fill/padding byte */
+ dhcp->msg_out->options[dhcp->options_out_len++] = 0;
+ }
+}
+
+#endif /* LWIP_DHCP */
projects / pes-rpp / rpp-lwip.git / commitdiff