FreeRDP/libfreerdp/utils/pcap.c
2015-06-26 20:38:30 +02:00

241 lines
5.0 KiB
C

/**
* FreeRDP: A Remote Desktop Protocol Implementation
* pcap File Format Utils
*
* Copyright 2011 Marc-Andre Moreau <marcandre.moreau@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.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <winpr/crt.h>
#include <freerdp/log.h>
#define TAG FREERDP_TAG("utils")
#ifndef _WIN32
#include <sys/time.h>
#else
#include <time.h>
#include <sys/timeb.h>
#include <winpr/windows.h>
int gettimeofday(struct timeval* tp, void* tz)
{
struct _timeb timebuffer;
_ftime(&timebuffer);
tp->tv_sec = (long) timebuffer.time;
tp->tv_usec = timebuffer.millitm * 1000;
return 0;
}
#endif
#include <freerdp/types.h>
#include <freerdp/utils/pcap.h>
#define PCAP_MAGIC 0xA1B2C3D4
static BOOL pcap_read_header(rdpPcap* pcap, pcap_header* header)
{
return fread((void*) header, sizeof(pcap_header), 1, pcap->fp) == 1;
}
static BOOL pcap_write_header(rdpPcap* pcap, pcap_header* header)
{
return fwrite((void*) header, sizeof(pcap_header), 1, pcap->fp) == 1;
}
static BOOL pcap_read_record_header(rdpPcap* pcap, pcap_record_header* record)
{
return fread((void*) record, sizeof(pcap_record_header), 1, pcap->fp) == 1;
}
static BOOL pcap_write_record_header(rdpPcap* pcap, pcap_record_header* record)
{
return fwrite((void*) record, sizeof(pcap_record_header), 1, pcap->fp) == 1;
}
static BOOL pcap_read_record(rdpPcap* pcap, pcap_record* record)
{
if (!pcap_read_record_header(pcap, &record->header))
return FALSE;
record->length = record->header.incl_len;
record->data = malloc(record->length);
if (!record->data)
return FALSE;
if (fread(record->data, record->length, 1, pcap->fp) != 1)
{
free(record->data);
record->data = NULL;
return FALSE;
}
return TRUE;
}
static BOOL pcap_write_record(rdpPcap* pcap, pcap_record* record)
{
return pcap_write_record_header(pcap, &record->header) &&
(fwrite(record->data, record->length, 1, pcap->fp) == 1);
}
BOOL pcap_add_record(rdpPcap* pcap, void* data, UINT32 length)
{
pcap_record* record;
struct timeval tp;
if (pcap->tail == NULL)
{
pcap->tail = (pcap_record*) calloc(1, sizeof(pcap_record));
if (!pcap->tail)
return FALSE;
pcap->head = pcap->tail;
pcap->record = pcap->head;
record = pcap->tail;
}
else
{
record = (pcap_record*) calloc(1, sizeof(pcap_record));
if (!record)
return FALSE;
pcap->tail->next = record;
pcap->tail = record;
}
if (pcap->record == NULL)
pcap->record = record;
record->data = data;
record->length = length;
record->header.incl_len = length;
record->header.orig_len = length;
gettimeofday(&tp, 0);
record->header.ts_sec = tp.tv_sec;
record->header.ts_usec = tp.tv_usec;
return TRUE;
}
BOOL pcap_has_next_record(rdpPcap* pcap)
{
if (pcap->file_size - (ftell(pcap->fp)) <= 16)
return FALSE;
return TRUE;
}
BOOL pcap_get_next_record_header(rdpPcap* pcap, pcap_record* record)
{
if (pcap_has_next_record(pcap) != TRUE)
return FALSE;
pcap_read_record_header(pcap, &record->header);
record->length = record->header.incl_len;
return TRUE;
}
BOOL pcap_get_next_record_content(rdpPcap* pcap, pcap_record* record)
{
return fread(record->data, record->length, 1, pcap->fp) == 1;
}
BOOL pcap_get_next_record(rdpPcap* pcap, pcap_record* record)
{
return pcap_has_next_record(pcap) &&
pcap_read_record(pcap, record);
}
rdpPcap* pcap_open(char* name, BOOL write)
{
rdpPcap* pcap;
FILE* pcap_fp = fopen(name, write ? "w+b" : "rb");
if (pcap_fp == NULL)
{
WLog_ERR(TAG, "opening pcap dump");
return NULL;
}
pcap = (rdpPcap*) calloc(1, sizeof(rdpPcap));
if (!pcap)
goto fail_close;
pcap->name = name;
pcap->write = write;
pcap->record_count = 0;
pcap->fp = pcap_fp;
if (write)
{
pcap->header.magic_number = 0xA1B2C3D4;
pcap->header.version_major = 2;
pcap->header.version_minor = 4;
pcap->header.thiszone = 0;
pcap->header.sigfigs = 0;
pcap->header.snaplen = 0xFFFFFFFF;
pcap->header.network = 0;
if (!pcap_write_header(pcap, &pcap->header))
goto fail;
}
else
{
fseek(pcap->fp, 0, SEEK_END);
pcap->file_size = (int) ftell(pcap->fp);
fseek(pcap->fp, 0, SEEK_SET);
if (!pcap_read_header(pcap, &pcap->header))
goto fail;
}
return pcap;
fail:
free(pcap);
fail_close:
fclose(pcap_fp);
return NULL;
}
void pcap_flush(rdpPcap* pcap)
{
while (pcap->record != NULL)
{
pcap_write_record(pcap, pcap->record);
pcap->record = pcap->record->next;
}
if (pcap->fp != NULL)
fflush(pcap->fp);
}
void pcap_close(rdpPcap* pcap)
{
pcap_flush(pcap);
if (pcap->fp != NULL)
fclose(pcap->fp);
free(pcap);
}