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