#if HAVE_CRT
#define _CRTDBG_MAP_ALLOC
#include <stdlib.h>
#include <crtdbg.h>
#endif //HAVE_CRT
/*
* Copyright (C) 2020, University of the Basque Country (UPV/EHU)
* Contact for licensing options: <licensing-mcpttclient(at)mcopenplatform(dot)com>
*
* The original file was part of Open Source Doubango Framework
* Copyright (C) 2010-2011 Mamadou Diop.
* Copyright (C) 2012 Doubango Telecom <http://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.c
* @brief DHCP/BOOTP (RFC 2131 - Dynamic Host Configuration Protocol) utilities function for P-CSCF discovery(RFC 3319 and 3361).
* Also implement: RFC 3315, 3118, 3319, 3825 (Geoconf), 4676 (Civic Addresses Configuration Information) ...
*/
#include "tnet_dhcp.h"
#include "../tnet_endianness.h"
#include "tsk_string.h"
#include "tsk_thread.h"
#include "tsk_memory.h"
#include "tsk_time.h"
#include "tsk_debug.h"
#include <string.h>
// Useful link: http://support.microsoft.com/?scid=kb%3Ben-us%3B169289&x=21&y=14
// Another one: http://www.iana.org/assignments/bootp-dhcp-parameters/
// Another one: http://www.slideshare.net/raini/DHCP-Presentation-v102
// RFC 3319 Dynamic Host Configuration Protocol (DHCPv6) Options for Session Initiation Protocol (SIP) Servers
// RFC 3361 Dynamic Host Configuration Protocol (DHCP-for-IPv4) Option for Session Initiation Protocol (SIP) Servers
/**@defgroup tnet_dhcp_group DHCPv4/BOOTP (RFC 2131) implementation.
*/
/**@ingroup tnet_dhcp_group
* Creates new DHCPv4 context.
*/
tnet_dhcp_ctx_t* tnet_dhcp_ctx_create()
{
return tsk_object_new(tnet_dhcp_ctx_def_t);
}
/**@ingroup tnet_dhcp_group
* Creates new DHCPv4 parameters.
*/
tnet_dhcp_params_t* tnet_dhcp_params_create()
{
return tsk_object_new(tnet_dhcp_params_def_t);
}
/* FIXME: USE retransmission mech (*2*2...)
*/
/**@ingroup tnet_dhcp_group
*/
tnet_dhcp_reply_t* tnet_dhcp_send_request(tnet_dhcp_ctx_t* ctx, tnet_dhcp_request_t* request)
{
tsk_buffer_t *output;
tnet_dhcp_reply_t* reply = tsk_null;
int ret;
struct timeval tv;
fd_set set;
uint64_t timeout = 0;
tsk_list_item_t *item;
const tnet_interface_t *iface;
tnet_socket_t *localsocket4 = tsk_null;
struct sockaddr_storage server;
if (!ctx || !request){
goto bail;
}
localsocket4 = tnet_socket_create(TNET_SOCKET_HOST_ANY, ctx->port_client, tnet_socket_type_udp_ipv4);
if (!TNET_SOCKET_IS_VALID(localsocket4)){
TSK_DEBUG_ERROR("Failed to create/bind DHCP client socket.");
goto bail;
}
/* Always wait for 200ms before retransmission */
tv.tv_sec = 0;
tv.tv_usec = (200 * 1000);
if (tnet_sockaddr_init("255.255.255.255", ctx->server_port, tnet_socket_type_udp_ipv4, &server)){
TNET_PRINT_LAST_ERROR("Failed to initialize the DHCP server address");
goto bail;
}
/* ENABLE BROADCASTING */
{
#if defined(SOLARIS)
char yes = '1';
#else
int yes = 1;
#endif
if (setsockopt(localsocket4->fd, SOL_SOCKET, SO_BROADCAST, (char*)&yes, sizeof(int))){
TNET_PRINT_LAST_ERROR("Failed to enable broadcast option");
goto bail;
}
}
/* Set timeout */
timeout = tsk_time_now() + ctx->timeout;
do
{
/* RFC 2131 - 3.6 Use of DHCP in clients with multiple interfaces
A client with multiple network interfaces must use DHCP through each
interface independently to obtain configuration information
parameters for those separate interfaces.
*/
tsk_list_foreach(item, ctx->interfaces){
iface = item->data;
/* Set FD */
FD_ZERO(&set);
FD_SET(localsocket4->fd, &set);
/* ciaddr */
if (request->type == dhcp_type_inform){
struct sockaddr_storage ss;
if (!tnet_getsockname(localsocket4->fd, &ss)){
uint32_t addr = tnet_htonl_2(&((struct sockaddr_in*)&ss)->sin_addr);
memcpy(&request->ciaddr, &addr, 4);
}
}
/* chaddr */
memset(request->chaddr, 0, sizeof(request->chaddr));
request->hlen = (uint8_t)(iface->mac_address_length > sizeof(request->chaddr) ? sizeof(request->chaddr) : iface->mac_address_length);
memcpy(request->chaddr, iface->mac_address, request->hlen);
/* Serialize and send to the server. */
if (!(output = tnet_dhcp_message_serialize(ctx, request))){
TSK_DEBUG_ERROR("Failed to serialize the DHCP message.");
goto next_iface;
}
/* Send the request to the DHCP server */
if ((ret = tnet_sockfd_sendto(localsocket4->fd, (const struct sockaddr*)&server, output->data, output->size)) < 0){
TNET_PRINT_LAST_ERROR("Failed to send DHCP request");
tsk_thread_sleep(150); // wait 150ms before trying the next iface.
goto next_iface;
}
/* wait for response */
if ((ret = select(localsocket4->fd + 1, &set, NULL, NULL, &tv)) < 0){ /* Error */
TNET_PRINT_LAST_ERROR("select have failed.");
tsk_thread_sleep(150); // wait 150ms before trying the next iface.
goto next_iface;
}
else if (ret == 0)
{ /* timeout ==> do nothing */
}
else
{ /* there is data to read */
unsigned int len = 0;
void* data = tsk_null;
/* Check how how many bytes are pending */
if ((ret = tnet_ioctlt(localsocket4->fd, FIONREAD, &len)) < 0){
goto next_iface;
}
/* Receive pending data */
#if HAVE_CRT //Debug memory
data = calloc(len, sizeof(uint8_t));
#else
data = tsk_calloc(len, sizeof(uint8_t));
#endif //HAVE_CRT
data = tsk_calloc(len, sizeof(uint8_t));
if ((ret = tnet_sockfd_recv(localsocket4->fd, data, len, 0)) < 0){
TSK_FREE(data);
TNET_PRINT_LAST_ERROR("Failed to receive DHCP dgrams.");
goto next_iface;
}
/* Parse the incoming response. */
reply = tnet_dhcp_message_deserialize(ctx, data, (tsk_size_t)ret);
TSK_FREE(data);
if (reply)
{ /* response successfuly parsed */
if (request->xid != reply->xid)
{ /* Not same transaction id ==> continue*/
TSK_OBJECT_SAFE_FREE(reply);
}
}
}
next_iface:
TSK_OBJECT_SAFE_FREE(output);
if (reply){
goto bail;
}
}
//break;//FIXME
} while (timeout > tsk_time_epoch());
bail:
TSK_OBJECT_SAFE_FREE(localsocket4);
return reply;
}
/**@ingroup tnet_dhcp_group
*/
tnet_dhcp_reply_t* tnet_dhcp_query(tnet_dhcp_ctx_t* ctx, tnet_dhcp_message_type_t type, tnet_dhcp_params_t* params)
{
tnet_dhcp_reply_t* reply = tsk_null;
tnet_dhcp_request_t* request = tnet_dhcp_request_create();
if (!ctx || !params || !request){
goto bail;
}
request->type = type;
tnet_dhcp_message_add_codes(request, params->codes, params->codes_count);
reply = tnet_dhcp_send_request(ctx, request);
bail:
TSK_OBJECT_SAFE_FREE(request);
return reply;
}
/**@ingroup tnet_dhcp_group
*/
int tnet_dhcp_params_add_code(tnet_dhcp_params_t* params, tnet_dhcp_option_code_t code)
{
if (params){
if (params->codes_count < TNET_DHCP_MAX_CODES){
unsigned i;
for (i = 0; i < params->codes_count; i++){
if (params->codes[i] == code){
return -3;
}
}
params->codes[params->codes_count++] = code;
}
else return -2;
}
return -1;
}
//=================================================================================================
// [[DHCP CONTEXT]] object definition
//
static tsk_object_t* tnet_dhcp_ctx_ctor(tsk_object_t * self, va_list * app)
{
tnet_dhcp_ctx_t *ctx = self;
if (ctx){
tnet_host_t host;
ctx->vendor_id = tsk_strdup(TNET_DHCP_VENDOR_ID_DEFAULT);
if (!tnet_gethostname(&host)){
ctx->hostname = tsk_strndup(host, tsk_strlen(host));
}
ctx->timeout = TNET_DHCP_TIMEOUT_DEFAULT;
ctx->max_msg_size = TNET_DHCP_MAX_MSG_SIZE;
ctx->port_client = TNET_DHCP_CLIENT_PORT;
ctx->server_port = TNET_DHCP_SERVER_PORT;
ctx->interfaces = tnet_get_interfaces();
if (!ctx->interfaces || TSK_LIST_IS_EMPTY(ctx->interfaces)){
TSK_DEBUG_ERROR("Failed to retrieve network interfaces.");
}
tsk_safeobj_init(ctx);
}
return self;
}
static tsk_object_t* tnet_dhcp_ctx_dtor(tsk_object_t * self)
{
tnet_dhcp_ctx_t *ctx = self;
if (ctx){
tsk_safeobj_deinit(ctx);
TSK_FREE(ctx->vendor_id);
TSK_FREE(ctx->hostname);
TSK_OBJECT_SAFE_FREE(ctx->interfaces);
}
return self;
}
static const tsk_object_def_t tnet_dhcp_ctx_def_s =
{
sizeof(tnet_dhcp_ctx_t),
tnet_dhcp_ctx_ctor,
tnet_dhcp_ctx_dtor,
tsk_null,
};
const tsk_object_def_t *tnet_dhcp_ctx_def_t = &tnet_dhcp_ctx_def_s;
//=================================================================================================
// [[DHCP PARAMS]] object definition
//
static tsk_object_t* tnet_dhcp_params_ctor(tsk_object_t * self, va_list * app)
{
tnet_dhcp_params_t *params = self;
if (params){
}
return self;
}
static tsk_object_t* tnet_dhcp_params_dtor(tsk_object_t * self)
{
tnet_dhcp_params_t *params = self;
if (params){
}
return self;
}
static const tsk_object_def_t tnet_dhcp_params_def_s =
{
sizeof(tnet_dhcp_params_t),
tnet_dhcp_params_ctor,
tnet_dhcp_params_dtor,
tsk_null,
};
const tsk_object_def_t *tnet_dhcp_params_def_t = &tnet_dhcp_params_def_s;