diff options
Diffstat (limited to 'libdhcp')
| -rw-r--r-- | libdhcp/CMakeLists.txt | 13 | ||||
| -rw-r--r-- | libdhcp/dhcp.c | 1035 | ||||
| -rw-r--r-- | libdhcp/include/libdhcp/dhcp.h | 182 |
3 files changed, 1230 insertions, 0 deletions
diff --git a/libdhcp/CMakeLists.txt b/libdhcp/CMakeLists.txt new file mode 100644 index 0000000..e525191 --- /dev/null +++ b/libdhcp/CMakeLists.txt @@ -0,0 +1,13 @@ +# libdhcp/CMakeLists.txt - TODO +# +# Copyright (C) 2024 Luke T. Shumaker <lukeshu@lukeshu.com> +# SPDX-Licence-Identifier: AGPL-3.0-or-later + +add_library(libdhcp INTERFACE) +target_include_directories(libdhcp SYSTEM INTERFACE ${CMAKE_CURRENT_SOURCE_DIR}/include) +target_sources(libdhcp INTERFACE + dhcp.c +) +target_link_libraries(libdhcp INTERFACE + libmisc +) diff --git a/libdhcp/dhcp.c b/libdhcp/dhcp.c new file mode 100644 index 0000000..b3340d0 --- /dev/null +++ b/libdhcp/dhcp.c @@ -0,0 +1,1035 @@ +/* libdhcp/dhcp.c - A DHCP client + * + * Copyright (C) 2024 Luke T. Shumaker <lukeshu@lukeshu.com> + * SPDX-Licence-Identifier: AGPL-3.0-or-later + * + * ----------------------------------------------------------------------------- + * https://github.com/Wiznet/ioLibrary_Driver/blob/b981401e7f3d07015619adf44c13998e13e777f9/Internet/DHCP/dhcp.c + * + * Copyright (c) 2013, WIZnet Co., LTD. + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * * Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * * 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. + * * Neither the name of the <ORGANIZATION> nor the names of its + * contributors may be used to endorse or promote products derived + * from this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "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 COPYRIGHT OWNER OR CONTRIBUTORS 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. + * + * SPDX-Licence-Identifier: BSD-3-Clause + * + * ----------------------------------------------------------------------------- + * https://github.com/Wiznet/ioLibrary_Driver/blob/b981401e7f3d07015619adf44c13998e13e777f9/license.txt + * + * Copyright (c) 2014 WIZnet Co.,Ltd. + * Copyright (c) WIZnet ioLibrary Project. + * All rights reserved. + * + * Permission is hereby granted, free of charge, to any person obtaining a copy + * of this software and associated documentation files (the "Software"), to deal + * in the Software without restriction, including without limitation the rights + * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell + * copies of the Software, and to permit persons to whom the Software is + * furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included in all + * copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE + * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, + * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE + * SOFTWARE. + * + * SPDX-Licence-Identifier: MIT + */ + +#include "socket.h" +#include "dhcp.h" + +/* If you want to display debug & processing message, Define _DHCP_DEBUG_ in dhcp.h */ + +#ifdef _DHCP_DEBUG_ + #include <stdio.h> +#endif + +/* DHCP state machine. */ +#define STATE_DHCP_INIT 0 ///< Initialize +#define STATE_DHCP_DISCOVER 1 ///< send DISCOVER and wait OFFER +#define STATE_DHCP_REQUEST 2 ///< send REQEUST and wait ACK or NACK +#define STATE_DHCP_LEASED 3 ///< ReceiveD ACK and IP leased +#define STATE_DHCP_REREQUEST 4 ///< send REQUEST for maintaining leased IP +#define STATE_DHCP_RELEASE 5 ///< No use +#define STATE_DHCP_STOP 6 ///< Stop processing DHCP + +#define DHCP_FLAGSBROADCAST 0x8000 ///< The broadcast value of flags in @ref RIP_MSG +#define DHCP_FLAGSUNICAST 0x0000 ///< The unicast value of flags in @ref RIP_MSG + +/* DHCP message OP code */ +#define DHCP_BOOTREQUEST 1 ///< Request Message used in op of @ref RIP_MSG +#define DHCP_BOOTREPLY 2 ///< Reply Message used i op of @ref RIP_MSG + +/* DHCP message type */ +#define DHCP_DISCOVER 1 ///< DISCOVER message in OPT of @ref RIP_MSG +#define DHCP_OFFER 2 ///< OFFER message in OPT of @ref RIP_MSG +#define DHCP_REQUEST 3 ///< REQUEST message in OPT of @ref RIP_MSG +#define DHCP_DECLINE 4 ///< DECLINE message in OPT of @ref RIP_MSG +#define DHCP_ACK 5 ///< ACK message in OPT of @ref RIP_MSG +#define DHCP_NAK 6 ///< NACK message in OPT of @ref RIP_MSG +#define DHCP_RELEASE 7 ///< RELEASE message in OPT of @ref RIP_MSG. No use +#define DHCP_INFORM 8 ///< INFORM message in OPT of @ref RIP_MSG. No use + +#define DHCP_HTYPE10MB 1 ///< Used in type of @ref RIP_MSG +#define DHCP_HTYPE100MB 2 ///< Used in type of @ref RIP_MSG + +#define DHCP_HLENETHERNET 6 ///< Used in hlen of @ref RIP_MSG +#define DHCP_HOPS 0 ///< Used in hops of @ref RIP_MSG +#define DHCP_SECS 0 ///< Used in secs of @ref RIP_MSG + +#define INFINITE_LEASETIME 0xffffffff ///< Infinite lease time + +#define OPT_SIZE 312 /// Max OPT size of @ref RIP_MSG +#define RIP_MSG_SIZE (236+OPT_SIZE) /// Max size of @ref RIP_MSG + +/* + * @brief DHCP option and value (cf. RFC1533) + */ +enum +{ + padOption = 0, + subnetMask = 1, + timerOffset = 2, + routersOnSubnet = 3, + timeServer = 4, + nameServer = 5, + dns = 6, + logServer = 7, + cookieServer = 8, + lprServer = 9, + impressServer = 10, + resourceLocationServer = 11, + hostName = 12, + bootFileSize = 13, + meritDumpFile = 14, + domainName = 15, + swapServer = 16, + rootPath = 17, + extentionsPath = 18, + IPforwarding = 19, + nonLocalSourceRouting = 20, + policyFilter = 21, + maxDgramReasmSize = 22, + defaultIPTTL = 23, + pathMTUagingTimeout = 24, + pathMTUplateauTable = 25, + ifMTU = 26, + allSubnetsLocal = 27, + broadcastAddr = 28, + performMaskDiscovery = 29, + maskSupplier = 30, + performRouterDiscovery = 31, + routerSolicitationAddr = 32, + staticRoute = 33, + trailerEncapsulation = 34, + arpCacheTimeout = 35, + ethernetEncapsulation = 36, + tcpDefaultTTL = 37, + tcpKeepaliveInterval = 38, + tcpKeepaliveGarbage = 39, + nisDomainName = 40, + nisServers = 41, + ntpServers = 42, + vendorSpecificInfo = 43, + netBIOSnameServer = 44, + netBIOSdgramDistServer = 45, + netBIOSnodeType = 46, + netBIOSscope = 47, + xFontServer = 48, + xDisplayManager = 49, + dhcpRequestedIPaddr = 50, + dhcpIPaddrLeaseTime = 51, + dhcpOptionOverload = 52, + dhcpMessageType = 53, + dhcpServerIdentifier = 54, + dhcpParamRequest = 55, + dhcpMsg = 56, + dhcpMaxMsgSize = 57, + dhcpT1value = 58, + dhcpT2value = 59, + dhcpClassIdentifier = 60, + dhcpClientIdentifier = 61, + endOption = 255 +}; + +/* + * @brief DHCP message format + */ +typedef struct { + uint8_t op; ///< @ref DHCP_BOOTREQUEST or @ref DHCP_BOOTREPLY + uint8_t htype; ///< @ref DHCP_HTYPE10MB or @ref DHCP_HTYPE100MB + uint8_t hlen; ///< @ref DHCP_HLENETHERNET + uint8_t hops; ///< @ref DHCP_HOPS + uint32_t xid; ///< @ref DHCP_XID This increase one every DHCP transaction. + uint16_t secs; ///< @ref DHCP_SECS + uint16_t flags; ///< @ref DHCP_FLAGSBROADCAST or @ref DHCP_FLAGSUNICAST + uint8_t ciaddr[4]; ///< @ref Request IP to DHCP sever + uint8_t yiaddr[4]; ///< @ref Offered IP from DHCP server + uint8_t siaddr[4]; ///< No use + uint8_t giaddr[4]; ///< No use + uint8_t chaddr[16]; ///< DHCP client 6bytes MAC address. Others is filled to zero + uint8_t sname[64]; ///< No use + uint8_t file[128]; ///< No use + uint8_t OPT[OPT_SIZE]; ///< Option +} RIP_MSG; + + + +uint8_t DHCP_SOCKET; // Socket number for DHCP + +uint8_t DHCP_SIP[4]; // DHCP Server IP address +uint8_t DHCP_REAL_SIP[4]; // For extract my DHCP server in a few DHCP server + +// Network information from DHCP Server +uint8_t OLD_allocated_ip[4] = {0, }; // Previous IP address +uint8_t DHCP_allocated_ip[4] = {0, }; // IP address from DHCP +uint8_t DHCP_allocated_gw[4] = {0, }; // Gateway address from DHCP +uint8_t DHCP_allocated_sn[4] = {0, }; // Subnet mask from DHCP +uint8_t DHCP_allocated_dns[4] = {0, }; // DNS address from DHCP + + +int8_t dhcp_state = STATE_DHCP_INIT; // DHCP state +int8_t dhcp_retry_count = 0; + +uint32_t dhcp_lease_time = INFINITE_LEASETIME; +volatile uint32_t dhcp_tick_1s = 0; // unit 1 second +uint32_t dhcp_tick_next = DHCP_WAIT_TIME ; + +uint32_t DHCP_XID; // Any number + +RIP_MSG* pDHCPMSG; // Buffer pointer for DHCP processing + +uint8_t HOST_NAME[] = DCHP_HOST_NAME; + +uint8_t DHCP_CHADDR[6]; // DHCP Client MAC address. + +/* The default callback function */ +void default_ip_assign(void); +void default_ip_update(void); +void default_ip_conflict(void); + +/* Callback handler */ +void (*dhcp_ip_assign)(void) = default_ip_assign; /* handler to be called when the IP address from DHCP server is first assigned */ +void (*dhcp_ip_update)(void) = default_ip_update; /* handler to be called when the IP address from DHCP server is updated */ +void (*dhcp_ip_conflict)(void) = default_ip_conflict; /* handler to be called when the IP address from DHCP server is conflict */ + +void reg_dhcp_cbfunc(void(*ip_assign)(void), void(*ip_update)(void), void(*ip_conflict)(void)); + +char NibbleToHex(uint8_t nibble); + +/* send DISCOVER message to DHCP server */ +void send_DHCP_DISCOVER(void); + +/* send REQEUST message to DHCP server */ +void send_DHCP_REQUEST(void); + +/* send DECLINE message to DHCP server */ +void send_DHCP_DECLINE(void); + +/* IP conflict check by sending ARP-request to leased IP and wait ARP-response. */ +int8_t check_DHCP_leasedIP(void); + +/* check the timeout in DHCP process */ +uint8_t check_DHCP_timeout(void); + +/* Initialize to timeout process. */ +void reset_DHCP_timeout(void); + +/* Parse message as OFFER and ACK and NACK from DHCP server.*/ +int8_t parseDHCPCMSG(void); + +/* The default handler of ip assign first */ +void default_ip_assign(void) +{ + setSIPR(DHCP_allocated_ip); + setSUBR(DHCP_allocated_sn); + setGAR (DHCP_allocated_gw); +} + +/* The default handler of ip changed */ +void default_ip_update(void) +{ + /* WIZchip Software Reset */ + setMR(MR_RST); + getMR(); // for delay + default_ip_assign(); + setSHAR(DHCP_CHADDR); +} + +/* The default handler of ip changed */ +void default_ip_conflict(void) +{ + // WIZchip Software Reset + setMR(MR_RST); + getMR(); // for delay + setSHAR(DHCP_CHADDR); +} + +/* register the call back func. */ +void reg_dhcp_cbfunc(void(*ip_assign)(void), void(*ip_update)(void), void(*ip_conflict)(void)) +{ + dhcp_ip_assign = default_ip_assign; + dhcp_ip_update = default_ip_update; + dhcp_ip_conflict = default_ip_conflict; + if(ip_assign) dhcp_ip_assign = ip_assign; + if(ip_update) dhcp_ip_update = ip_update; + if(ip_conflict) dhcp_ip_conflict = ip_conflict; +} + +/* make the common DHCP message */ +void makeDHCPMSG(void) +{ + uint8_t bk_mac[6]; + uint8_t* ptmp; + uint8_t i; + getSHAR(bk_mac); + pDHCPMSG->op = DHCP_BOOTREQUEST; + pDHCPMSG->htype = DHCP_HTYPE10MB; + pDHCPMSG->hlen = DHCP_HLENETHERNET; + pDHCPMSG->hops = DHCP_HOPS; + ptmp = (uint8_t*)(&pDHCPMSG->xid); + *(ptmp+0) = (uint8_t)((DHCP_XID & 0xFF000000) >> 24); + *(ptmp+1) = (uint8_t)((DHCP_XID & 0x00FF0000) >> 16); + *(ptmp+2) = (uint8_t)((DHCP_XID & 0x0000FF00) >> 8); + *(ptmp+3) = (uint8_t)((DHCP_XID & 0x000000FF) >> 0); + pDHCPMSG->secs = DHCP_SECS; + ptmp = (uint8_t*)(&pDHCPMSG->flags); + *(ptmp+0) = (uint8_t)((DHCP_FLAGSBROADCAST & 0xFF00) >> 8); + *(ptmp+1) = (uint8_t)((DHCP_FLAGSBROADCAST & 0x00FF) >> 0); + + pDHCPMSG->ciaddr[0] = 0; + pDHCPMSG->ciaddr[1] = 0; + pDHCPMSG->ciaddr[2] = 0; + pDHCPMSG->ciaddr[3] = 0; + + pDHCPMSG->yiaddr[0] = 0; + pDHCPMSG->yiaddr[1] = 0; + pDHCPMSG->yiaddr[2] = 0; + pDHCPMSG->yiaddr[3] = 0; + + pDHCPMSG->siaddr[0] = 0; + pDHCPMSG->siaddr[1] = 0; + pDHCPMSG->siaddr[2] = 0; + pDHCPMSG->siaddr[3] = 0; + + pDHCPMSG->giaddr[0] = 0; + pDHCPMSG->giaddr[1] = 0; + pDHCPMSG->giaddr[2] = 0; + pDHCPMSG->giaddr[3] = 0; + + pDHCPMSG->chaddr[0] = DHCP_CHADDR[0]; + pDHCPMSG->chaddr[1] = DHCP_CHADDR[1]; + pDHCPMSG->chaddr[2] = DHCP_CHADDR[2]; + pDHCPMSG->chaddr[3] = DHCP_CHADDR[3]; + pDHCPMSG->chaddr[4] = DHCP_CHADDR[4]; + pDHCPMSG->chaddr[5] = DHCP_CHADDR[5]; + + for (i = 6; i < 16; i++) pDHCPMSG->chaddr[i] = 0; + for (i = 0; i < 64; i++) pDHCPMSG->sname[i] = 0; + for (i = 0; i < 128; i++) pDHCPMSG->file[i] = 0; + + // MAGIC_COOKIE + pDHCPMSG->OPT[0] = (uint8_t)((MAGIC_COOKIE & 0xFF000000) >> 24); + pDHCPMSG->OPT[1] = (uint8_t)((MAGIC_COOKIE & 0x00FF0000) >> 16); + pDHCPMSG->OPT[2] = (uint8_t)((MAGIC_COOKIE & 0x0000FF00) >> 8); + pDHCPMSG->OPT[3] = (uint8_t) (MAGIC_COOKIE & 0x000000FF) >> 0; +} + +/* SEND DHCP DISCOVER */ +void send_DHCP_DISCOVER(void) +{ + uint16_t i; + uint8_t ip[4]; + uint16_t k = 0; + + makeDHCPMSG(); + DHCP_SIP[0]=0; + DHCP_SIP[1]=0; + DHCP_SIP[2]=0; + DHCP_SIP[3]=0; + DHCP_REAL_SIP[0]=0; + DHCP_REAL_SIP[1]=0; + DHCP_REAL_SIP[2]=0; + DHCP_REAL_SIP[3]=0; + + k = 4; // because MAGIC_COOKIE already made by makeDHCPMSG() + + // Option Request Param + pDHCPMSG->OPT[k++] = dhcpMessageType; + pDHCPMSG->OPT[k++] = 0x01; + pDHCPMSG->OPT[k++] = DHCP_DISCOVER; + + // Client identifier + pDHCPMSG->OPT[k++] = dhcpClientIdentifier; + pDHCPMSG->OPT[k++] = 0x07; + pDHCPMSG->OPT[k++] = 0x01; + pDHCPMSG->OPT[k++] = DHCP_CHADDR[0]; + pDHCPMSG->OPT[k++] = DHCP_CHADDR[1]; + pDHCPMSG->OPT[k++] = DHCP_CHADDR[2]; + pDHCPMSG->OPT[k++] = DHCP_CHADDR[3]; + pDHCPMSG->OPT[k++] = DHCP_CHADDR[4]; + pDHCPMSG->OPT[k++] = DHCP_CHADDR[5]; + + // host name + pDHCPMSG->OPT[k++] = hostName; + pDHCPMSG->OPT[k++] = 0; // fill zero length of hostname + for(i = 0 ; HOST_NAME[i] != 0; i++) + pDHCPMSG->OPT[k++] = HOST_NAME[i]; + pDHCPMSG->OPT[k++] = NibbleToHex(DHCP_CHADDR[3] >> 4); + pDHCPMSG->OPT[k++] = NibbleToHex(DHCP_CHADDR[3]); + pDHCPMSG->OPT[k++] = NibbleToHex(DHCP_CHADDR[4] >> 4); + pDHCPMSG->OPT[k++] = NibbleToHex(DHCP_CHADDR[4]); + pDHCPMSG->OPT[k++] = NibbleToHex(DHCP_CHADDR[5] >> 4); + pDHCPMSG->OPT[k++] = NibbleToHex(DHCP_CHADDR[5]); + pDHCPMSG->OPT[k - (i+6+1)] = i+6; // length of hostname + + pDHCPMSG->OPT[k++] = dhcpParamRequest; + pDHCPMSG->OPT[k++] = 0x06; // length of request + pDHCPMSG->OPT[k++] = subnetMask; + pDHCPMSG->OPT[k++] = routersOnSubnet; + pDHCPMSG->OPT[k++] = dns; + pDHCPMSG->OPT[k++] = domainName; + pDHCPMSG->OPT[k++] = dhcpT1value; + pDHCPMSG->OPT[k++] = dhcpT2value; + pDHCPMSG->OPT[k++] = endOption; + + for (i = k; i < OPT_SIZE; i++) pDHCPMSG->OPT[i] = 0; + + // send broadcasting packet + ip[0] = 255; + ip[1] = 255; + ip[2] = 255; + ip[3] = 255; + +#ifdef _DHCP_DEBUG_ + printf("> Send DHCP_DISCOVER\r\n"); +#endif + + sendto(DHCP_SOCKET, (uint8_t *)pDHCPMSG, RIP_MSG_SIZE, ip, DHCP_SERVER_PORT); +} + +/* SEND DHCP REQUEST */ +void send_DHCP_REQUEST(void) +{ + int i; + uint8_t ip[4]; + uint16_t k = 0; + + makeDHCPMSG(); + + if(dhcp_state == STATE_DHCP_LEASED || dhcp_state == STATE_DHCP_REREQUEST) + { + *((uint8_t*)(&pDHCPMSG->flags)) = ((DHCP_FLAGSUNICAST & 0xFF00)>> 8); + *((uint8_t*)(&pDHCPMSG->flags)+1) = (DHCP_FLAGSUNICAST & 0x00FF); + pDHCPMSG->ciaddr[0] = DHCP_allocated_ip[0]; + pDHCPMSG->ciaddr[1] = DHCP_allocated_ip[1]; + pDHCPMSG->ciaddr[2] = DHCP_allocated_ip[2]; + pDHCPMSG->ciaddr[3] = DHCP_allocated_ip[3]; + ip[0] = DHCP_SIP[0]; + ip[1] = DHCP_SIP[1]; + ip[2] = DHCP_SIP[2]; + ip[3] = DHCP_SIP[3]; + } + else + { + ip[0] = 255; + ip[1] = 255; + ip[2] = 255; + ip[3] = 255; + } + + k = 4; // because MAGIC_COOKIE already made by makeDHCPMSG() + + // Option Request Param. + pDHCPMSG->OPT[k++] = dhcpMessageType; + pDHCPMSG->OPT[k++] = 0x01; + pDHCPMSG->OPT[k++] = DHCP_REQUEST; + + pDHCPMSG->OPT[k++] = dhcpClientIdentifier; + pDHCPMSG->OPT[k++] = 0x07; + pDHCPMSG->OPT[k++] = 0x01; + pDHCPMSG->OPT[k++] = DHCP_CHADDR[0]; + pDHCPMSG->OPT[k++] = DHCP_CHADDR[1]; + pDHCPMSG->OPT[k++] = DHCP_CHADDR[2]; + pDHCPMSG->OPT[k++] = DHCP_CHADDR[3]; + pDHCPMSG->OPT[k++] = DHCP_CHADDR[4]; + pDHCPMSG->OPT[k++] = DHCP_CHADDR[5]; + + if(ip[3] == 255) // if(dchp_state == STATE_DHCP_LEASED || dchp_state == DHCP_REREQUEST_STATE) + { + pDHCPMSG->OPT[k++] = dhcpRequestedIPaddr; + pDHCPMSG->OPT[k++] = 0x04; + pDHCPMSG->OPT[k++] = DHCP_allocated_ip[0]; + pDHCPMSG->OPT[k++] = DHCP_allocated_ip[1]; + pDHCPMSG->OPT[k++] = DHCP_allocated_ip[2]; + pDHCPMSG->OPT[k++] = DHCP_allocated_ip[3]; + + pDHCPMSG->OPT[k++] = dhcpServerIdentifier; + pDHCPMSG->OPT[k++] = 0x04; + pDHCPMSG->OPT[k++] = DHCP_SIP[0]; + pDHCPMSG->OPT[k++] = DHCP_SIP[1]; + pDHCPMSG->OPT[k++] = DHCP_SIP[2]; + pDHCPMSG->OPT[k++] = DHCP_SIP[3]; + } + + // host name + pDHCPMSG->OPT[k++] = hostName; + pDHCPMSG->OPT[k++] = 0; // length of hostname + for(i = 0 ; HOST_NAME[i] != 0; i++) + pDHCPMSG->OPT[k++] = HOST_NAME[i]; + pDHCPMSG->OPT[k++] = NibbleToHex(DHCP_CHADDR[3] >> 4); + pDHCPMSG->OPT[k++] = NibbleToHex(DHCP_CHADDR[3]); + pDHCPMSG->OPT[k++] = NibbleToHex(DHCP_CHADDR[4] >> 4); + pDHCPMSG->OPT[k++] = NibbleToHex(DHCP_CHADDR[4]); + pDHCPMSG->OPT[k++] = NibbleToHex(DHCP_CHADDR[5] >> 4); + pDHCPMSG->OPT[k++] = NibbleToHex(DHCP_CHADDR[5]); + pDHCPMSG->OPT[k - (i+6+1)] = i+6; // length of hostname + + pDHCPMSG->OPT[k++] = dhcpParamRequest; + pDHCPMSG->OPT[k++] = 0x08; + pDHCPMSG->OPT[k++] = subnetMask; + pDHCPMSG->OPT[k++] = routersOnSubnet; + pDHCPMSG->OPT[k++] = dns; + pDHCPMSG->OPT[k++] = domainName; + pDHCPMSG->OPT[k++] = dhcpT1value; + pDHCPMSG->OPT[k++] = dhcpT2value; + pDHCPMSG->OPT[k++] = performRouterDiscovery; + pDHCPMSG->OPT[k++] = staticRoute; + pDHCPMSG->OPT[k++] = endOption; + + for (i = k; i < OPT_SIZE; i++) pDHCPMSG->OPT[i] = 0; + +#ifdef _DHCP_DEBUG_ + printf("> Send DHCP_REQUEST\r\n"); +#endif + + sendto(DHCP_SOCKET, (uint8_t *)pDHCPMSG, RIP_MSG_SIZE, ip, DHCP_SERVER_PORT); + +} + +/* SEND DHCP DHCPDECLINE */ +void send_DHCP_DECLINE(void) +{ + int i; + uint8_t ip[4]; + uint16_t k = 0; + + makeDHCPMSG(); + + k = 4; // because MAGIC_COOKIE already made by makeDHCPMSG() + + *((uint8_t*)(&pDHCPMSG->flags)) = ((DHCP_FLAGSUNICAST & 0xFF00)>> 8); + *((uint8_t*)(&pDHCPMSG->flags)+1) = (DHCP_FLAGSUNICAST & 0x00FF); + + // Option Request Param. + pDHCPMSG->OPT[k++] = dhcpMessageType; + pDHCPMSG->OPT[k++] = 0x01; + pDHCPMSG->OPT[k++] = DHCP_DECLINE; + + pDHCPMSG->OPT[k++] = dhcpClientIdentifier; + pDHCPMSG->OPT[k++] = 0x07; + pDHCPMSG->OPT[k++] = 0x01; + pDHCPMSG->OPT[k++] = DHCP_CHADDR[0]; + pDHCPMSG->OPT[k++] = DHCP_CHADDR[1]; + pDHCPMSG->OPT[k++] = DHCP_CHADDR[2]; + pDHCPMSG->OPT[k++] = DHCP_CHADDR[3]; + pDHCPMSG->OPT[k++] = DHCP_CHADDR[4]; + pDHCPMSG->OPT[k++] = DHCP_CHADDR[5]; + + pDHCPMSG->OPT[k++] = dhcpRequestedIPaddr; + pDHCPMSG->OPT[k++] = 0x04; + pDHCPMSG->OPT[k++] = DHCP_allocated_ip[0]; + pDHCPMSG->OPT[k++] = DHCP_allocated_ip[1]; + pDHCPMSG->OPT[k++] = DHCP_allocated_ip[2]; + pDHCPMSG->OPT[k++] = DHCP_allocated_ip[3]; + + pDHCPMSG->OPT[k++] = dhcpServerIdentifier; + pDHCPMSG->OPT[k++] = 0x04; + pDHCPMSG->OPT[k++] = DHCP_SIP[0]; + pDHCPMSG->OPT[k++] = DHCP_SIP[1]; + pDHCPMSG->OPT[k++] = DHCP_SIP[2]; + pDHCPMSG->OPT[k++] = DHCP_SIP[3]; + + pDHCPMSG->OPT[k++] = endOption; + + for (i = k; i < OPT_SIZE; i++) pDHCPMSG->OPT[i] = 0; + + //send broadcasting packet + ip[0] = 0xFF; + ip[1] = 0xFF; + ip[2] = 0xFF; + ip[3] = 0xFF; + +#ifdef _DHCP_DEBUG_ + printf("\r\n> Send DHCP_DECLINE\r\n"); +#endif + + sendto(DHCP_SOCKET, (uint8_t *)pDHCPMSG, RIP_MSG_SIZE, ip, DHCP_SERVER_PORT); +} + +/* PARSE REPLY pDHCPMSG */ +int8_t parseDHCPMSG(void) +{ + uint8_t svr_addr[6]; + uint16_t svr_port; + uint16_t len; + + uint8_t * p; + uint8_t * e; + uint8_t type = 0; + uint8_t opt_len; + + if((len = getSn_RX_RSR(DHCP_SOCKET)) > 0) + { + len = recvfrom(DHCP_SOCKET, (uint8_t *)pDHCPMSG, len, svr_addr, &svr_port); + #ifdef _DHCP_DEBUG_ + printf("DHCP message : %d.%d.%d.%d(%d) %d received. \r\n",svr_addr[0],svr_addr[1],svr_addr[2], svr_addr[3],svr_port, len); + #endif + } + else return 0; + if (svr_port == DHCP_SERVER_PORT) { + // compare mac address + if ( (pDHCPMSG->chaddr[0] != DHCP_CHADDR[0]) || (pDHCPMSG->chaddr[1] != DHCP_CHADDR[1]) || + (pDHCPMSG->chaddr[2] != DHCP_CHADDR[2]) || (pDHCPMSG->chaddr[3] != DHCP_CHADDR[3]) || + (pDHCPMSG->chaddr[4] != DHCP_CHADDR[4]) || (pDHCPMSG->chaddr[5] != DHCP_CHADDR[5]) ) + { +#ifdef _DHCP_DEBUG_ + printf("No My DHCP Message. This message is ignored.\r\n"); +#endif + return 0; + } + //compare DHCP server ip address + if((DHCP_SIP[0]!=0) || (DHCP_SIP[1]!=0) || (DHCP_SIP[2]!=0) || (DHCP_SIP[3]!=0)){ + if( ((svr_addr[0]!=DHCP_SIP[0])|| (svr_addr[1]!=DHCP_SIP[1])|| (svr_addr[2]!=DHCP_SIP[2])|| (svr_addr[3]!=DHCP_SIP[3])) && + ((svr_addr[0]!=DHCP_REAL_SIP[0])|| (svr_addr[1]!=DHCP_REAL_SIP[1])|| (svr_addr[2]!=DHCP_REAL_SIP[2])|| (svr_addr[3]!=DHCP_REAL_SIP[3])) ) + { +#ifdef _DHCP_DEBUG_ + printf("Another DHCP sever send a response message. This is ignored.\r\n"); +#endif + return 0; + } + } + p = (uint8_t *)(&pDHCPMSG->op); + p = p + 240; // 240 = sizeof(RIP_MSG) + MAGIC_COOKIE size in RIP_MSG.opt - sizeof(RIP_MSG.opt) + e = p + (len - 240); + + while ( p < e ) { + + switch ( *p ) { + + case endOption : + p = e; // for break while(p < e) + break; + case padOption : + p++; + break; + case dhcpMessageType : + p++; + p++; + type = *p++; + break; + case subnetMask : + p++; + p++; + DHCP_allocated_sn[0] = *p++; + DHCP_allocated_sn[1] = *p++; + DHCP_allocated_sn[2] = *p++; + DHCP_allocated_sn[3] = *p++; + break; + case routersOnSubnet : + p++; + opt_len = *p++; + DHCP_allocated_gw[0] = *p++; + DHCP_allocated_gw[1] = *p++; + DHCP_allocated_gw[2] = *p++; + DHCP_allocated_gw[3] = *p++; + p = p + (opt_len - 4); + break; + case dns : + p++; + opt_len = *p++; + DHCP_allocated_dns[0] = *p++; + DHCP_allocated_dns[1] = *p++; + DHCP_allocated_dns[2] = *p++; + DHCP_allocated_dns[3] = *p++; + p = p + (opt_len - 4); + break; + case dhcpIPaddrLeaseTime : + p++; + opt_len = *p++; + dhcp_lease_time = *p++; + dhcp_lease_time = (dhcp_lease_time << 8) + *p++; + dhcp_lease_time = (dhcp_lease_time << 8) + *p++; + dhcp_lease_time = (dhcp_lease_time << 8) + *p++; + #ifdef _DHCP_DEBUG_ + dhcp_lease_time = 10; + #endif + break; + case dhcpServerIdentifier : + p++; + opt_len = *p++; + DHCP_SIP[0] = *p++; + DHCP_SIP[1] = *p++; + DHCP_SIP[2] = *p++; + DHCP_SIP[3] = *p++; + DHCP_REAL_SIP[0]=svr_addr[0]; + DHCP_REAL_SIP[1]=svr_addr[1]; + DHCP_REAL_SIP[2]=svr_addr[2]; + DHCP_REAL_SIP[3]=svr_addr[3]; + break; + default : + p++; + opt_len = *p++; + p += opt_len; + break; + } // switch + } // while + } // if + return type; +} + +uint8_t DHCP_run(void) +{ + uint8_t type; + uint8_t ret; + + if(dhcp_state == STATE_DHCP_STOP) return DHCP_STOPPED; + + if(getSn_SR(DHCP_SOCKET) != SOCK_UDP) + socket(DHCP_SOCKET, Sn_MR_UDP, DHCP_CLIENT_PORT, 0x00); + + ret = DHCP_RUNNING; + type = parseDHCPMSG(); + + switch ( dhcp_state ) { + case STATE_DHCP_INIT : + DHCP_allocated_ip[0] = 0; + DHCP_allocated_ip[1] = 0; + DHCP_allocated_ip[2] = 0; + DHCP_allocated_ip[3] = 0; + send_DHCP_DISCOVER(); + dhcp_state = STATE_DHCP_DISCOVER; + break; + case STATE_DHCP_DISCOVER : + if (type == DHCP_OFFER){ +#ifdef _DHCP_DEBUG_ + printf("> Receive DHCP_OFFER\r\n"); +#endif + DHCP_allocated_ip[0] = pDHCPMSG->yiaddr[0]; + DHCP_allocated_ip[1] = pDHCPMSG->yiaddr[1]; + DHCP_allocated_ip[2] = pDHCPMSG->yiaddr[2]; + DHCP_allocated_ip[3] = pDHCPMSG->yiaddr[3]; + + send_DHCP_REQUEST(); + dhcp_state = STATE_DHCP_REQUEST; + } else ret = check_DHCP_timeout(); + break; + + case STATE_DHCP_REQUEST : + if (type == DHCP_ACK) { + +#ifdef _DHCP_DEBUG_ + printf("> Receive DHCP_ACK\r\n"); +#endif + if (check_DHCP_leasedIP()) { + // Network info assignment from DHCP + dhcp_ip_assign(); + reset_DHCP_timeout(); + + dhcp_state = STATE_DHCP_LEASED; + } else { + // IP address conflict occurred + reset_DHCP_timeout(); + dhcp_ip_conflict(); + dhcp_state = STATE_DHCP_INIT; + } + } else if (type == DHCP_NAK) { + +#ifdef _DHCP_DEBUG_ + printf("> Receive DHCP_NACK\r\n"); +#endif + + reset_DHCP_timeout(); + + dhcp_state = STATE_DHCP_DISCOVER; + } else ret = check_DHCP_timeout(); + break; + + case STATE_DHCP_LEASED : + ret = DHCP_IP_LEASED; + if ((dhcp_lease_time != INFINITE_LEASETIME) && ((dhcp_lease_time/2) < dhcp_tick_1s)) { + +#ifdef _DHCP_DEBUG_ + printf("> Maintains the IP address \r\n"); +#endif + + type = 0; + OLD_allocated_ip[0] = DHCP_allocated_ip[0]; + OLD_allocated_ip[1] = DHCP_allocated_ip[1]; + OLD_allocated_ip[2] = DHCP_allocated_ip[2]; + OLD_allocated_ip[3] = DHCP_allocated_ip[3]; + + DHCP_XID++; + + send_DHCP_REQUEST(); + + reset_DHCP_timeout(); + + dhcp_state = STATE_DHCP_REREQUEST; + } + break; + + case STATE_DHCP_REREQUEST : + ret = DHCP_IP_LEASED; + if (type == DHCP_ACK) { + dhcp_retry_count = 0; + if (OLD_allocated_ip[0] != DHCP_allocated_ip[0] || + OLD_allocated_ip[1] != DHCP_allocated_ip[1] || + OLD_allocated_ip[2] != DHCP_allocated_ip[2] || + OLD_allocated_ip[3] != DHCP_allocated_ip[3]) + { + ret = DHCP_IP_CHANGED; + dhcp_ip_update(); + #ifdef _DHCP_DEBUG_ + printf(">IP changed.\r\n"); + #endif + + } + #ifdef _DHCP_DEBUG_ + else printf(">IP is continued.\r\n"); + #endif + reset_DHCP_timeout(); + dhcp_state = STATE_DHCP_LEASED; + } else if (type == DHCP_NAK) { + +#ifdef _DHCP_DEBUG_ + printf("> Receive DHCP_NACK, Failed to maintain ip\r\n"); +#endif + + reset_DHCP_timeout(); + + dhcp_state = STATE_DHCP_DISCOVER; + } else ret = check_DHCP_timeout(); + break; + default : + break; + } + + return ret; +} + +void DHCP_stop(void) +{ + close(DHCP_SOCKET); + dhcp_state = STATE_DHCP_STOP; +} + +uint8_t check_DHCP_timeout(void) +{ + uint8_t ret = DHCP_RUNNING; + + if (dhcp_retry_count < MAX_DHCP_RETRY) { + if (dhcp_tick_next < dhcp_tick_1s) { + + switch ( dhcp_state ) { + case STATE_DHCP_DISCOVER : +// printf("<<timeout>> state : STATE_DHCP_DISCOVER\r\n"); + send_DHCP_DISCOVER(); + break; + + case STATE_DHCP_REQUEST : +// printf("<<timeout>> state : STATE_DHCP_REQUEST\r\n"); + + send_DHCP_REQUEST(); + break; + + case STATE_DHCP_REREQUEST : +// printf("<<timeout>> state : STATE_DHCP_REREQUEST\r\n"); + + send_DHCP_REQUEST(); + break; + + default : + break; + } + + dhcp_tick_1s = 0; + dhcp_tick_next = dhcp_tick_1s + DHCP_WAIT_TIME; + dhcp_retry_count++; + } + } else { // timeout occurred + + switch(dhcp_state) { + case STATE_DHCP_DISCOVER: + dhcp_state = STATE_DHCP_INIT; + ret = DHCP_FAILED; + break; + case STATE_DHCP_REQUEST: + case STATE_DHCP_REREQUEST: + send_DHCP_DISCOVER(); + dhcp_state = STATE_DHCP_DISCOVER; + break; + default : + break; + } + reset_DHCP_timeout(); + } + return ret; +} + +int8_t check_DHCP_leasedIP(void) +{ + uint8_t tmp; + int32_t ret; + + //WIZchip RCR value changed for ARP Timeout count control + tmp = getRCR(); + setRCR(0x03); + + // IP conflict detection : ARP request - ARP reply + // Broadcasting ARP Request for check the IP conflict using UDP sendto() function + ret = sendto(DHCP_SOCKET, (uint8_t *)"CHECK_IP_CONFLICT", 17, DHCP_allocated_ip, 5000); + + // RCR value restore + setRCR(tmp); + + if(ret == SOCKERR_TIMEOUT) { + // UDP send Timeout occurred : allocated IP address is unique, DHCP Success + +#ifdef _DHCP_DEBUG_ + printf("\r\n> Check leased IP - OK\r\n"); +#endif + + return 1; + } else { + // Received ARP reply or etc : IP address conflict occur, DHCP Failed + send_DHCP_DECLINE(); + + ret = dhcp_tick_1s; + while((dhcp_tick_1s - ret) < 2) ; // wait for 1s over; wait to complete to send DECLINE message; + + return 0; + } +} + +void DHCP_init(uint8_t s, uint8_t * buf) +{ + uint8_t zeroip[4] = {0,0,0,0}; + getSHAR(DHCP_CHADDR); + if((DHCP_CHADDR[0] | DHCP_CHADDR[1] | DHCP_CHADDR[2] | DHCP_CHADDR[3] | DHCP_CHADDR[4] | DHCP_CHADDR[5]) == 0x00) + { + // assigning temporary mac address, you should be set SHAR before call this function. + DHCP_CHADDR[0] = 0x00; + DHCP_CHADDR[1] = 0x08; + DHCP_CHADDR[2] = 0xdc; + DHCP_CHADDR[3] = 0x00; + DHCP_CHADDR[4] = 0x00; + DHCP_CHADDR[5] = 0x00; + setSHAR(DHCP_CHADDR); + } + + DHCP_SOCKET = s; // SOCK_DHCP + pDHCPMSG = (RIP_MSG*)buf; + DHCP_XID = 0x12345678; + { + DHCP_XID += DHCP_CHADDR[3]; + DHCP_XID += DHCP_CHADDR[4]; + DHCP_XID += DHCP_CHADDR[5]; + DHCP_XID += (DHCP_CHADDR[3] ^ DHCP_CHADDR[4] ^ DHCP_CHADDR[5]); + } + // WIZchip Netinfo Clear + setSIPR(zeroip); + setGAR(zeroip); + + reset_DHCP_timeout(); + dhcp_state = STATE_DHCP_INIT; +} + + +/* Reset the DHCP timeout count and retry count. */ +void reset_DHCP_timeout(void) +{ + dhcp_tick_1s = 0; + dhcp_tick_next = DHCP_WAIT_TIME; + dhcp_retry_count = 0; +} + +void DHCP_time_handler(void) +{ + dhcp_tick_1s++; +} + +void getIPfromDHCP(uint8_t* ip) +{ + ip[0] = DHCP_allocated_ip[0]; + ip[1] = DHCP_allocated_ip[1]; + ip[2] = DHCP_allocated_ip[2]; + ip[3] = DHCP_allocated_ip[3]; +} + +void getGWfromDHCP(uint8_t* ip) +{ + ip[0] =DHCP_allocated_gw[0]; + ip[1] =DHCP_allocated_gw[1]; + ip[2] =DHCP_allocated_gw[2]; + ip[3] =DHCP_allocated_gw[3]; +} + +void getSNfromDHCP(uint8_t* ip) +{ + ip[0] = DHCP_allocated_sn[0]; + ip[1] = DHCP_allocated_sn[1]; + ip[2] = DHCP_allocated_sn[2]; + ip[3] = DHCP_allocated_sn[3]; +} + +void getDNSfromDHCP(uint8_t* ip) +{ + ip[0] = DHCP_allocated_dns[0]; + ip[1] = DHCP_allocated_dns[1]; + ip[2] = DHCP_allocated_dns[2]; + ip[3] = DHCP_allocated_dns[3]; +} + +uint32_t getDHCPLeasetime(void) +{ + return dhcp_lease_time; +} + +char NibbleToHex(uint8_t nibble) +{ + nibble &= 0x0F; + if (nibble <= 9) + return nibble + '0'; + else + return nibble + ('A'-0x0A); +} diff --git a/libdhcp/include/libdhcp/dhcp.h b/libdhcp/include/libdhcp/dhcp.h new file mode 100644 index 0000000..7d1f61d --- /dev/null +++ b/libdhcp/include/libdhcp/dhcp.h @@ -0,0 +1,182 @@ +/* libdhcp/dhcp.c - A DHCP client + * + * Copyright (C) 2024 Luke T. Shumaker <lukeshu@lukeshu.com> + * SPDX-Licence-Identifier: AGPL-3.0-or-later + * + * ----------------------------------------------------------------------------- + * https://github.com/Wiznet/ioLibrary_Driver/blob/b981401e7f3d07015619adf44c13998e13e777f9/Internet/DHCP/dhcp.h + * + * Copyright (c) 2013, WIZnet Co., LTD. + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * * Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * * 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. + * * Neither the name of the <ORGANIZATION> nor the names of its + * contributors may be used to endorse or promote products derived + * from this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "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 COPYRIGHT OWNER OR CONTRIBUTORS 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. + * + * SPDX-Licence-Identifier: BSD-3-Clause + * + * ----------------------------------------------------------------------------- + * https://github.com/Wiznet/ioLibrary_Driver/blob/b981401e7f3d07015619adf44c13998e13e777f9/license.txt + * + * Copyright (c) 2014 WIZnet Co.,Ltd. + * Copyright (c) WIZnet ioLibrary Project. + * All rights reserved. + * + * Permission is hereby granted, free of charge, to any person obtaining a copy + * of this software and associated documentation files (the "Software"), to deal + * in the Software without restriction, including without limitation the rights + * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell + * copies of the Software, and to permit persons to whom the Software is + * furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included in all + * copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE + * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, + * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE + * SOFTWARE. + * + * SPDX-Licence-Identifier: MIT + */ + +#ifndef _DHCP_H_ +#define _DHCP_H_ + +#ifdef __cplusplus +extern "C" { +#endif + +/* + * @brief + * @details If you want to display debug & processing message, Define _DHCP_DEBUG_ + * @note If defined, it depends on <stdio.h> + */ +//#define _DHCP_DEBUG_ + + +/* Retry to processing DHCP */ +#define MAX_DHCP_RETRY 2 ///< Maximum retry count +#define DHCP_WAIT_TIME 10 ///< Wait Time 10s + + +/* UDP port numbers for DHCP */ +#define DHCP_SERVER_PORT 67 ///< DHCP server port number +#define DHCP_CLIENT_PORT 68 ///< DHCP client port number + + +#define MAGIC_COOKIE 0x63825363 ///< You should not modify it number. + +#define DCHP_HOST_NAME "WIZnet\0" + +/* + * @brief return value of @ref DHCP_run() + */ +enum +{ + DHCP_FAILED = 0, ///< Processing Fail + DHCP_RUNNING, ///< Processing DHCP protocol + DHCP_IP_ASSIGN, ///< First Occupy IP from DHPC server (if cbfunc == null, act as default default_ip_assign) + DHCP_IP_CHANGED, ///< Change IP address by new ip from DHCP (if cbfunc == null, act as default default_ip_update) + DHCP_IP_LEASED, ///< Stand by + DHCP_STOPPED ///< Stop processing DHCP protocol +}; + +/* + * @brief DHCP client initialization (outside of the main loop) + * @param s - socket number + * @param buf - buffer for processing DHCP message + */ +void DHCP_init(uint8_t s, uint8_t * buf); + +/* + * @brief DHCP 1s Tick Timer handler + * @note SHOULD BE register to your system 1s Tick timer handler + */ +void DHCP_time_handler(void); + +/* + * @brief Register call back function + * @param ip_assign - callback func when IP is assigned from DHCP server first + * @param ip_update - callback func when IP is changed + * @param ip_conflict - callback func when the assigned IP is conflict with others. + */ +void reg_dhcp_cbfunc(void(*ip_assign)(void), void(*ip_update)(void), void(*ip_conflict)(void)); + +/* + * @brief DHCP client in the main loop + * @return The value is as the follow \n + * @ref DHCP_FAILED \n + * @ref DHCP_RUNNING \n + * @ref DHCP_IP_ASSIGN \n + * @ref DHCP_IP_CHANGED \n + * @ref DHCP_IP_LEASED \n + * @ref DHCP_STOPPED \n + * + * @note This function is always called by you main task. + */ +uint8_t DHCP_run(void); + +/* + * @brief Stop DHCP processing + * @note If you want to restart. call DHCP_init() and DHCP_run() + */ +void DHCP_stop(void); + +/* Get Network information assigned from DHCP server */ +/* + * @brief Get IP address + * @param ip - IP address to be returned + */ +void getIPfromDHCP(uint8_t* ip); +/* + * @brief Get Gateway address + * @param ip - Gateway address to be returned + */ +void getGWfromDHCP(uint8_t* ip); +/* + * @brief Get Subnet mask value + * @param ip - Subnet mask to be returned + */ +void getSNfromDHCP(uint8_t* ip); +/* + * @brief Get DNS address + * @param ip - DNS address to be returned + */ +void getDNSfromDHCP(uint8_t* ip); + +/* + * @brief Get the leased time by DHCP sever + * @return unit 1s + */ +uint32_t getDHCPLeasetime(void); + +#ifdef __cplusplus +} +#endif + +#endif /* _DHCP_H_ */ |