diff options
Diffstat (limited to 'tinyNET/src/dhcp/tnet_dhcp_message.c')
| -rw-r--r-- | tinyNET/src/dhcp/tnet_dhcp_message.c | 355 |
1 files changed, 355 insertions, 0 deletions
diff --git a/tinyNET/src/dhcp/tnet_dhcp_message.c b/tinyNET/src/dhcp/tnet_dhcp_message.c new file mode 100644 index 0000000..e4eff3b --- /dev/null +++ b/tinyNET/src/dhcp/tnet_dhcp_message.c @@ -0,0 +1,355 @@ +/* +* Copyright (C) 2009-2010 Mamadou Diop. +* +* Contact: Mamadou Diop <diopmamadou(at)doubango.org> +* +* This file is part of Open Source Doubango Framework. +* +* DOUBANGO is free software: you can redistribute it and/or modify +* it under the terms of the GNU General Public License as published by +* the Free Software Foundation, either version 3 of the License, or +* (at your option) any later version. +* +* DOUBANGO is distributed in the hope that it will be useful, +* but WITHOUT ANY WARRANTY; without even the implied warranty of +* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +* GNU General Public License for more details. +* +* You should have received a copy of the GNU General Public License +* along with DOUBANGO. +* +*/ +/**@file tnet_dhcp_message.c + * @brief DHCP Message as per RFC 2131 subclause 2. + * + * @author Mamadou Diop <diopmamadou(at)doubango.org> + * + * @date Created: Sat Nov 8 16:54:58 2009 mdiop + */ +#include "tnet_dhcp_message.h" +#include "tnet_dhcp.h" + +#include "../tnet_utils.h" +#include "../tnet_endianness.h" + +#include "tsk_time.h" +#include "tsk_memory.h" +#include "tsk_string.h" +#include "tsk_debug.h" + +#include <string.h> + +tnet_dhcp_message_t* tnet_dhcp_message_create(tnet_dhcp_message_op_t opcode) +{ + return tsk_object_new(tnet_dhcp_message_def_t, opcode); +} + +tnet_dhcp_request_t* tnet_dhcp_request_create() +{ + return tnet_dhcp_message_create(dhcp_op_bootrequest); +} + +tnet_dhcp_message_t* tnet_dhcp_reply_create() +{ + return tnet_dhcp_message_create(dhcp_op_bootreply); +} + +tsk_buffer_t* tnet_dhcp_message_serialize(const tnet_dhcp_ctx_t *ctx, const tnet_dhcp_message_t *message) +{ + tsk_buffer_t* output = 0; + uint8_t _1byte; + uint16_t _2bytes; + uint32_t _4bytes; + + /* Check message validity */ + if(!message){ + goto bail; + } + + output = tsk_buffer_create_null(); + + /*== OP HTYPE HLEN HOPS */ + _4bytes = (((uint32_t)(message->op)) << 24) | + (((uint32_t)(message->htype)) << 16) | + (((uint16_t)(message->hlen)) << 8) | message->hops; + _4bytes = tnet_ntohl(_4bytes); + tsk_buffer_append(output, &(_4bytes), 4); + + /*== XID */ + _4bytes = tnet_ntohl(message->xid); + tsk_buffer_append(output, &(_4bytes), 4); + /*== SECS */ + _2bytes = tnet_ntohs(message->secs); + tsk_buffer_append(output, &(_2bytes), 2); + /*== FLAGS */ + _2bytes = tnet_ntohs(message->flags); + tsk_buffer_append(output, &(_2bytes), 2); + /*== CIADDR */ + _4bytes = tnet_ntohl(message->ciaddr); + tsk_buffer_append(output, &(_4bytes), 4); + /*== YIADDR */ + _4bytes = tnet_ntohl(message->yiaddr); + tsk_buffer_append(output, &(_4bytes), 4); + /*== SIADDR */ + _4bytes = tnet_ntohl(message->siaddr); + tsk_buffer_append(output, &(_4bytes), 4); + /*== GIADDR */ + _4bytes = tnet_ntohl(message->giaddr); + tsk_buffer_append(output, &(_4bytes), 4); + /*== CHADDR */ + tsk_buffer_append(output, message->chaddr, sizeof(message->chaddr)); + /*== sname (unused) */ + tsk_buffer_append(output, message->sname, sizeof(message->sname)); + /*== file (unused) */ + tsk_buffer_append(output, message->file, sizeof(message->file)); + /*== Magic Cookie */ + _4bytes = tnet_ntohl(TNET_DHCP_MAGIC_COOKIE); + tsk_buffer_append(output, &(_4bytes), 4); + + /*== Message Type (option 53) + */ + tnet_dhcp_option_serializeex(dhcp_code_DHCP_Msg_Type, 1, &message->type, output); + + /*== Client Identifier (option 61) ==> RFC 2132 - 9.14. Client-identifier + Code Len Type Client-Identifier + +-----+-----+-----+-----+-----+--- + | 61 | n | t1 | i1 | i2 | ... + +-----+-----+-----+-----+-----+--- + */ + if(message->hlen){ + uint8_t client_id[17]; // 16 /*sizeof(chaddr)*/+ 1/*htype*/ + /*if(client_id)*/{ + client_id[0] = message->htype; + memcpy(&client_id[1], message->chaddr, message->hlen); + tnet_dhcp_option_serializeex(dhcp_code_Client_Id, (message->hlen+1), client_id, output); + } + } + /*== Host name(10) ==> RFC 2132 - 3.14. Host Name Option + Code Len Host Name + +-----+-----+-----+-----+-----+-----+-----+-----+-- + | 12 | n | h1 | h2 | h3 | h4 | h5 | h6 | ... + +-----+-----+-----+-----+-----+-----+-----+-----+-- + */ + if(TNET_DHCP_MESSAGE_IS_REQUEST(message) && ctx->hostname){ + tnet_dhcp_option_serializeex(dhcp_code_Hostname, tsk_strlen(ctx->hostname), ctx->hostname, output); + } + /*== Vendor classId(60) ==> RFC 2132 - 9.13. Vendor class identifier + Code Len Vendor class Identifier + +-----+-----+-----+-----+--- + | 60 | n | i1 | i2 | ... + +-----+-----+-----+-----+--- + */ + if(TNET_DHCP_MESSAGE_IS_REQUEST(message) && ctx->vendor_id){ + tnet_dhcp_option_serializeex(dhcp_code_Class_Id, tsk_strlen(ctx->vendor_id), ctx->vendor_id, output); + } + + /*== RFC 2132 - 9.10. Maximum DHCP Message Size (57) + Code Len Length + +-----+-----+-----+-----+ + | 57 | 2 | l1 | l2 | + +-----+-----+-----+-----+ + */ + if(TNET_DHCP_MESSAGE_IS_REQUEST(message) && ctx->max_msg_size){ + _2bytes = tnet_ntohs(ctx->max_msg_size); + tnet_dhcp_option_serializeex(dhcp_code_DHCP_Max_Msg_Size, 2, &_2bytes, output); + } + + /*== DHCP Options + */ + { + tsk_list_item_t *item; + tnet_dhcp_option_t* option; + tsk_list_foreach(item, message->options) + { + option = (tnet_dhcp_option_t*)item->data; + if(tnet_dhcp_option_serialize(option, output)){ + TSK_DEBUG_WARN("Failed to serialize DHCP OPTION (%u)", option->code); + } + } + } + + /* RFC 2131 - 4.1 Constructing and sending DHCP messages + The last option must always be the 'end' option. + */ + _1byte = dhcp_code_End; + tsk_buffer_append(output, &(_1byte), 1); + +bail: + return output; +} + +tnet_dhcp_message_t* tnet_dhcp_message_deserialize(const struct tnet_dhcp_ctx_s *ctx, const uint8_t *data, tsk_size_t size) +{ + tnet_dhcp_message_t *message = 0; + uint8_t *dataPtr, *dataEnd, *dataStart; + + if(!data || !size) + { + goto bail; + } + + if(size < TNET_DHCP_MESSAGE_MIN_SIZE){ + TSK_DEBUG_ERROR("DHCP message too short."); + goto bail; + } + + if(!(message = tnet_dhcp_reply_create())){ /* If REQUEST OP will be overridedden */ + TSK_DEBUG_ERROR("Failed to create new DHCP message."); + goto bail; + } + + dataPtr = (uint8_t*)data; + dataStart = dataPtr; + dataEnd = (dataStart + size); + + /*== op (1)*/ + message->op = *(dataPtr++); + /*== htype (1) */ + message->htype = *(dataPtr++); + /*== hlen (1) */ + message->hlen = *(dataPtr++); + /*== htype (1) */ + message->hops = *(dataPtr++); + /*== xid (4) */ + message->xid= tnet_htonl_2(dataPtr); + dataPtr += 4; + /*== secs (2) */ + message->secs = tnet_ntohs_2(dataPtr); + dataPtr += 2; + /*== flags (2) */ + message->flags = tnet_ntohs_2(dataPtr); + dataPtr += 2; + /*== ciaddr (4) */ + message->ciaddr= tnet_htonl_2(dataPtr); + dataPtr += 4; + /*== yiaddr (4) */ + message->yiaddr= tnet_htonl_2(dataPtr); + dataPtr += 4; + /*== siaddr (4) */ + message->siaddr= tnet_htonl_2(dataPtr); + dataPtr += 4; + /*== giaddr (4) */ + message->giaddr= tnet_htonl_2(dataPtr); + dataPtr += 4; + /*== chaddr (16[max]) */ + memcpy(message->chaddr, dataPtr, message->hlen>16 ? 16 : message->hlen); + dataPtr += 16; + /*== sname (64) */ + memcpy(message->sname, dataPtr, 64); + dataPtr += 64; + /*== file (128) */ + memcpy(message->file, dataPtr, 128); + dataPtr += 128; + /*== Magic Cookie (4) */ + if(tnet_htonl_2(dataPtr) != TNET_DHCP_MAGIC_COOKIE){ + TSK_DEBUG_ERROR("Invalid DHCP magic cookie."); + // Do not exit ==> continue parsing. + } + dataPtr += 4; + + /*== options (variable) */ + while(dataPtr<dataEnd && *dataPtr!=dhcp_code_End) + { + tnet_dhcp_option_t* option = tnet_dhcp_option_deserialize(dataPtr, (dataEnd-dataPtr)); + if(option && option->value){ + + if(option->code == dhcp_code_DHCP_Msg_Type){ + message->type = (tnet_dhcp_message_type_t)*TSK_BUFFER_TO_U8(option->value); + } + + dataPtr += option->value->size + 2/*Code Len*/; + tsk_list_push_back_data(message->options, (void**)&option); + } + else break; + } + +bail: + return message; +} + + +const tnet_dhcp_option_t* tnet_dhcp_message_find_option(const tnet_dhcp_message_t *message, tnet_dhcp_option_code_t code) +{ + tsk_list_item_t *item; + + if(!message){ + goto bail; + } + + tsk_list_foreach(item, message->options) + { + if(((tnet_dhcp_option_t*)item->data)->code == code){ + return ((tnet_dhcp_option_t*)item->data); + } + } + +bail: + return 0; +} + +int tnet_dhcp_message_add_codes(tnet_dhcp_message_t *self, tnet_dhcp_option_code_t codes[], unsigned codes_count) +{ + int ret = -1; + + if(!self){ + goto bail; + } + if(codes_count){ + unsigned i; + + tnet_dhcp_option_paramslist_t* option = (tnet_dhcp_option_paramslist_t*)tnet_dhcp_message_find_option(self, dhcp_code_Parameter_List); + if(!option){ + tnet_dhcp_option_paramslist_t *option_paramslist = tnet_dhcp_option_paramslist_create(); + option = option_paramslist; + tsk_list_push_back_data(self->options, (void**)&option_paramslist); + } + + for(i=0; i<codes_count; i++){ + if((ret = tnet_dhcp_option_paramslist_add_code(option, codes[i]))){ + break; + } + } + } + +bail: + return ret; +} + + +//================================================================================================= +// [[DHCP MESSAGE]] object definition +// +static tsk_object_t* tnet_dhcp_message_ctor(tsk_object_t * self, va_list * app) +{ + tnet_dhcp_message_t *message = self; + if(message){ + static uint32_t __dhcpmessage_unique_xid = 0;//(uint32_t)tsk_time_epoch(); + + message->op = va_arg(*app, tnet_dhcp_message_op_t); + message->htype = tnet_htype_Ethernet_10Mb; + message->hlen = 0x06; + + message->xid = ++(__dhcpmessage_unique_xid); + message->options = tsk_list_create(); + } + return self; +} + +static tsk_object_t* tnet_dhcp_message_dtor(tsk_object_t * self) +{ + tnet_dhcp_message_t *message = self; + if(message){ + TSK_OBJECT_SAFE_FREE(message->options); + } + return self; +} + +static const tsk_object_def_t tnet_dhcp_message_def_s = +{ + sizeof(tnet_dhcp_message_t), + tnet_dhcp_message_ctor, + tnet_dhcp_message_dtor, + tsk_null, +}; +const tsk_object_def_t *tnet_dhcp_message_def_t = &tnet_dhcp_message_def_s; + |
