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272 lines
6.2 KiB
272 lines
6.2 KiB
/**
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* xrdp: A Remote Desktop Protocol server.
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*
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* Copyright (C) Laxmikant Rashinkar 2013 LK.Rashinkar@gmail.com
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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*/
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/*
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* manage I/O for redirected file system and devices
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*/
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#include "parse.h"
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#include "os_calls.h"
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#include "irp.h"
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/* module based logging */
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#define LOG_ERROR 0
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#define LOG_INFO 1
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#define LOG_DEBUG 2
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#ifndef LOG_LEVEL
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#define LOG_LEVEL LOG_ERROR
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#endif
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#define log_error(_params...) \
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{ \
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g_write("[%10.10u]: IRP %s: %d : ERROR: ", \
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g_time3(), __func__, __LINE__); \
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g_writeln (_params); \
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}
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#define log_info(_params...) \
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{ \
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if (LOG_INFO <= LOG_LEVEL) \
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{ \
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g_write("[%10.10u]: IRP %s: %d : ", \
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g_time3(), __func__, __LINE__); \
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g_writeln (_params); \
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} \
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}
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#define log_debug(_params...) \
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{ \
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if (LOG_DEBUG <= LOG_LEVEL) \
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{ \
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g_write("[%10.10u]: IRP %s: %d : ", \
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g_time3(), __func__, __LINE__); \
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g_writeln (_params); \
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} \
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}
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IRP *g_irp_head = NULL;
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/**
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* Create a new IRP and append to linked list
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*
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* @return new IRP or NULL on error
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*****************************************************************************/
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IRP * devredir_irp_new()
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{
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IRP *irp;
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IRP *irp_last;
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log_debug("entered");
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/* create new IRP */
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irp = g_new0(IRP, 1);
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if (irp == NULL)
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{
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log_error("system out of memory!");
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return NULL;
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}
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/* insert at end of linked list */
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if ((irp_last = devredir_irp_get_last()) == NULL)
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{
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/* list is empty, this is the first entry */
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g_irp_head = irp;
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}
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else
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{
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irp_last->next = irp;
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irp->prev = irp_last;
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}
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log_debug("new IRP=%p", irp);
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return irp;
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}
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/**
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* Clone specified IRP
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*
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* @return new IRP or NULL on error
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*****************************************************************************/
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IRP * devredir_irp_clone(IRP *irp)
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{
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IRP *new_irp;
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IRP *prev;
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IRP *next;
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if ((new_irp = devredir_irp_new()) == NULL)
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return NULL;
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/* save link pointers */
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prev = new_irp->prev;
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next = new_irp->next;
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/* copy all members */
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g_memcpy(new_irp, irp, sizeof(IRP));
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/* restore link pointers */
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new_irp->prev = prev;
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new_irp->next = next;
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return new_irp;
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}
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/**
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* Delete specified IRP from linked list
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*
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* @return 0 on success, -1 on failure
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*****************************************************************************/
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int devredir_irp_delete(IRP *irp)
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{
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IRP *lirp = g_irp_head;
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if ((irp == NULL) || (lirp == NULL))
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return -1;
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log_debug("irp=%p completion_id=%d type=%d",
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irp, irp->CompletionId, irp->completion_type);
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devredir_irp_dump(); // LK_TODO
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while (lirp)
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{
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if (lirp == irp)
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break;
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lirp = lirp->next;
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}
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if (lirp == NULL)
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return -1; /* did not find specified irp */
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if (lirp->prev == NULL)
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{
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/* we are at head of linked list */
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if (lirp->next == NULL)
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{
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/* only one element in list */
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g_free(lirp);
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g_irp_head = NULL;
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devredir_irp_dump(); // LK_TODO
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return 0;
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}
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lirp->next->prev = NULL;
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g_irp_head = lirp->next;
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g_free(lirp);
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}
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else if (lirp->next == NULL)
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{
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/* we are at tail of linked list */
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lirp->prev->next = NULL;
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g_free(lirp);
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}
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else
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{
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/* we are in between */
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lirp->prev->next = lirp->next;
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lirp->next->prev = lirp->prev;
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g_free(lirp);
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}
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devredir_irp_dump(); // LK_TODO
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return 0;
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}
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/**
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* Return IRP containing specified completion_id
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*****************************************************************************/
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IRP *devredir_irp_find(tui32 completion_id)
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{
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IRP *irp = g_irp_head;
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while (irp)
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{
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if (irp->CompletionId == completion_id)
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{
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log_debug("returning irp=%p", irp);
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return irp;
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}
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irp = irp->next;
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}
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log_debug("returning irp=NULL");
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return NULL;
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}
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IRP * devredir_irp_find_by_fileid(tui32 FileId)
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{
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IRP *irp = g_irp_head;
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while (irp)
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{
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if (irp->FileId == FileId)
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{
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log_debug("returning irp=%p", irp);
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return irp;
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}
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irp = irp->next;
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}
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log_debug("returning irp=NULL");
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return NULL;
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}
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/**
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* Return last IRP in linked list
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*****************************************************************************/
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IRP * devredir_irp_get_last()
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{
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IRP *irp = g_irp_head;
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while (irp)
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{
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if (irp->next == NULL)
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break;
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irp = irp->next;
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}
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log_debug("returning irp=%p", irp);
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return irp;
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}
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void devredir_irp_dump()
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{
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IRP *irp = g_irp_head;
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log_debug("------- dumping IRPs --------");
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while (irp)
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{
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log_debug(" completion_id=%d\tcompletion_type=%d\tFileId=%d",
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irp->CompletionId, irp->completion_type, irp->FileId);
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irp = irp->next;
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}
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log_debug("------- dumping IRPs done ---");
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}
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