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request_response.c
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#include "request_response.h"
#include "extendablebuffer.h"
#include "domainstatistic.h"
#include "dnsparser.h"
#include "dnsgenerator.h"
#include "dnscache.h"
#include "addresschunk.h"
#include "ipchunk.h"
#include "internalsocket.h"
#include "utils.h"
#include "common.h"
static AddressChunk Addresses;
static BOOL ParallelQuery;
static sa_family_t ParallelMainFamily;
static Array Addresses_Array;
static int LoadDedicatedServer(ConfigFileInfo *ConfigInfo)
{
const StringList *DedicatedServer = ConfigGetStringList(ConfigInfo, "DedicatedServer");
const char *Itr = NULL;
char Domain[256];
char Server[64];
Itr = StringList_GetNext(DedicatedServer, NULL);
while( Itr != NULL )
{
if( sscanf(Itr, "%s %s", Domain, Server) < 2 )
{
INFO("Invalid Option in `DedicatedServer' : %s\n", Itr);
continue;
}
INFO("Add a dedicated Server %s for %s\n", Server, Domain);
AddressChunk_AddADedicatedAddress_FromString(&Addresses, Domain, Server);
Itr = StringList_GetNext(DedicatedServer, Itr);
}
StringList_Free(DedicatedServer);
return 0;
}
int InitAddress(ConfigFileInfo *ConfigInfo)
{
StringList *tcpaddrs = ConfigGetStringList(ConfigInfo, "TCPServer");
StringList *udpaddrs = ConfigGetStringList(ConfigInfo, "UDPServer");
const char *Itr = NULL;
if( AddressChunk_Init(&Addresses) != 0 )
{
return -1;
}
Itr = StringList_GetNext(tcpaddrs, NULL);
while( Itr != NULL )
{
if( AddressChunk_AddATCPAddress_FromString(&Addresses, Itr) != 0 )
{
INFO("Bad address : %s\n", Itr);
} else {
}
Itr = StringList_GetNext(tcpaddrs, Itr);
}
Itr = StringList_GetNext(udpaddrs, NULL);
while( Itr != NULL )
{
if( AddressChunk_AddAUDPAddress_FromString(&Addresses, Itr) != 0 )
{
INFO("Bad address : %s\n", Itr);
} else {
}
Itr = StringList_GetNext(udpaddrs, Itr);
}
ParallelQuery = ConfigGetBoolean(ConfigInfo, "ParallelQuery");
if( ParallelQuery == TRUE )
{
int NumberOfAddr;
int AddrLen;
sa_family_t SubFamily;
struct sockaddr *OneAddr;
NumberOfAddr = StringList_Count(udpaddrs);
if( NumberOfAddr <= 0 )
{
ERRORMSG("No UDP server specified, cannot use parallel query.\n")
ParallelQuery = FALSE;
} else {
AddressChunk_GetOneUDPBySubscript(&Addresses, &ParallelMainFamily, 0);
if( ParallelMainFamily == AF_INET )
{
AddrLen = sizeof(struct sockaddr);
} else {
AddrLen = sizeof(struct sockaddr_in6);
}
Array_Init(&Addresses_Array, AddrLen, NumberOfAddr, FALSE, NULL);
while( NumberOfAddr != 0 )
{
OneAddr = AddressChunk_GetOneUDPBySubscript(&Addresses, &SubFamily, NumberOfAddr - 1);
if( OneAddr != NULL && SubFamily == ParallelMainFamily )
{
Array_PushBack(&Addresses_Array, OneAddr, NULL);
}
--NumberOfAddr;
}
}
}
StringList_Free(tcpaddrs);
StringList_Free(udpaddrs);
return LoadDedicatedServer(ConfigInfo);
}
static sa_family_t GetAddress(ControlHeader *Header,
DNSQuaryProtocol ProtocolUsed,
struct sockaddr **Addresses_List,
int *NumberOfAddresses,
sa_family_t *Family
)
{
*Addresses_List = AddressChunk_GetDedicated(&Addresses, Family, Header -> RequestingDomain, &(Header -> RequestingDomainHashValue));
if( *Addresses_List == NULL )
{
if( ProtocolUsed == DNS_QUARY_PROTOCOL_UDP && ParallelQuery == TRUE )
{
*Addresses_List = (struct sockaddr *)Addresses_Array.Data;
if( NumberOfAddresses != NULL )
{
*NumberOfAddresses = Addresses_Array.Used;
}
*Family = ParallelMainFamily;
} else {
*Addresses_List = AddressChunk_GetOne(&Addresses, Family, ProtocolUsed);
if( NumberOfAddresses != NULL )
{
*NumberOfAddresses = 1;
}
}
} else {
if( NumberOfAddresses != NULL )
{
*NumberOfAddresses = 1;
}
}
return *Family;
}
BOOL SocketIsStillReadable(SOCKET Sock, int timeout)
{
fd_set rfd;
struct timeval TimeLimit = {timeout / 1000, (timeout % 1000) * 1000};
FD_ZERO(&rfd);
FD_SET(Sock, &rfd);
switch(select(Sock + 1, &rfd, NULL, NULL, &TimeLimit))
{
case SOCKET_ERROR:
case 0:
return FALSE;
break;
case 1:
return TRUE;
break;
default:
return FALSE;
break;
}
}
void ClearSocketBuffer(SOCKET Sock)
{
char BlackHole[128];
int OriginErrorCode = GET_LAST_ERROR();
while( SocketIsStillReadable(Sock, 0) )
{
recvfrom(Sock, BlackHole, sizeof(BlackHole), 0, NULL, NULL);
}
SET_LAST_ERROR(OriginErrorCode);
}
void ClearTCPSocketBuffer(SOCKET Sock, int Length)
{
char BlackHole[128];
int OriginErrorCode = GET_LAST_ERROR();
while( Length > 0 )
{
Length -= recv(Sock,
BlackHole,
sizeof(BlackHole) < Length ? sizeof(BlackHole) : Length,
MSG_NOSIGNAL
);
}
SET_LAST_ERROR(OriginErrorCode);
}
static BOOL UDPAppendEDNSOpt = FALSE;
static BOOL UDPAntiPollution = FALSE;
void SetUDPAntiPollution(BOOL State)
{
UDPAntiPollution = State;
}
void SetUDPAppendEDNSOpt(BOOL State)
{
UDPAppendEDNSOpt = State;
}
#define IP_MISCELLANEOUS_TYPE_UNKNOWN 0
#define IP_MISCELLANEOUS_TYPE_BLOCK 1
#define IP_MISCELLANEOUS_TYPE_SUBSTITUTE 2
static IpChunk *IPMiscellaneous = NULL;
static BOOL DoIPMiscellaneous(const char *RequestEntity, const char *Domain, BOOL Block, BOOL EDNSEnabled)
{
int AnswerCount;
if( ((DNSHeader *)RequestEntity) -> Flags.ResponseCode != 0 )
{
return TRUE;
}
AnswerCount = DNSGetAnswerCount(RequestEntity);
if( AnswerCount > 0 )
{
const unsigned char *Answer;
uint32_t *Data;
int ActionType = IP_MISCELLANEOUS_TYPE_UNKNOWN;
const char *ActionData;
if( Block == TRUE && EDNSEnabled == TRUE && DNSGetAdditionalCount(RequestEntity) == 0 )
{
DomainStatistic_Add(Domain, NULL, STATISTIC_TYPE_POISONED);
ShowBlockedMessage(Domain, RequestEntity, "False package, discarded");
return TRUE;
}
Answer = (const unsigned char *)DNSGetAnswerRecordPosition(RequestEntity, 1);
Data = (uint32_t *)DNSGetResourceDataPos(Answer);
if( Block == TRUE && DNSGetRecordType(Answer) == DNS_TYPE_A && *Answer != 0xC0 )
{
if( IPMiscellaneous != NULL )
{
if( IpChunk_Find(IPMiscellaneous, *Data, &ActionType, NULL) == TRUE && ActionType == IP_MISCELLANEOUS_TYPE_BLOCK )
{
ShowBlockedMessage(Domain, RequestEntity, "False package, discarded");
} else {
ShowBlockedMessage(Domain, RequestEntity, "False package, discarded. And its IP address is not in `UDPBlock_IP'");
}
}
DomainStatistic_Add(Domain, NULL, STATISTIC_TYPE_POISONED);
return TRUE;
}
if( IPMiscellaneous != NULL )
{
int Loop = 1;
const unsigned char *Answer1 = Answer;
uint32_t *Data1 = Data;
do
{
if( DNSGetRecordType(Answer1) == DNS_TYPE_A && IpChunk_Find(IPMiscellaneous, *Data1, &ActionType, &ActionData) == TRUE )
{
switch( ActionType )
{
case IP_MISCELLANEOUS_TYPE_BLOCK:
if( Block == TRUE )
{
ShowBlockedMessage(Domain, RequestEntity, "One of the IPs is in `UDPBlock_IP', discarded");
DomainStatistic_Add(Domain, NULL, STATISTIC_TYPE_POISONED);
return TRUE;
}
break;
case IP_MISCELLANEOUS_TYPE_SUBSTITUTE:
memcpy(Data1, ActionData, 4);
break;
default:
break;
}
}
++Loop;
if( Loop > AnswerCount )
{
break;
}
Answer1 = (const unsigned char *)DNSGetAnswerRecordPosition(RequestEntity, Loop);
Data1 = (uint32_t *)DNSGetResourceDataPos(Answer1);
} while( TRUE );
}
return FALSE;
} else {
return FALSE;
}
}
static void SendBack(SOCKET Socket,
ControlHeader *Header,
QueryContext *Context,
int Length,
char Protocal,
StatisticType Type,
BOOL NeededBlock
)
{
char *RequestEntity = (char *)(Header + 1);
int32_t QueryContextNumber;
QueryContextEntry *ThisContext;
DNSGetHostName(RequestEntity,
DNSJumpHeader(RequestEntity),
Header -> RequestingDomain
);
StrToLower(Header -> RequestingDomain);
Header -> RequestingDomainHashValue = ELFHash(Header -> RequestingDomain, 0);
QueryContextNumber = InternalInterface_QueryContextFind(Context, *(uint16_t *)RequestEntity, Header -> RequestingDomainHashValue);
if( QueryContextNumber >= 0 )
{
ThisContext = Bst_GetDataByNumber(Context, QueryContextNumber);
DomainStatistic_Add(Header -> RequestingDomain, &(Header -> RequestingDomainHashValue), Type);
if( DoIPMiscellaneous(RequestEntity, Header -> RequestingDomain, NeededBlock, ThisContext -> EDNSEnabled) == FALSE )
{
if( ThisContext -> NeededHeader == TRUE )
{
sendto(Socket,
(const char *)Header,
Length,
0,
(const struct sockaddr *)&(ThisContext -> Context.BackAddress.Addr),
GetAddressLength(ThisContext -> Context.BackAddress.family)
);
} else {
sendto(Socket,
RequestEntity,
Length - sizeof(ControlHeader),
0,
(const struct sockaddr *)&(ThisContext -> Context.BackAddress.Addr),
GetAddressLength(ThisContext -> Context.BackAddress.family)
);
}
InternalInterface_QueryContextRemoveByNumber(Context, QueryContextNumber);
ShowNormalMassage(ThisContext -> Agent, Header -> RequestingDomain, RequestEntity, Length - sizeof(ControlHeader), Protocal);
DNSCache_AddItemsToCache(RequestEntity, time(NULL));
}
} else {
/* ShowNormalMassage("Redundant Package", Header -> RequestingDomain, RequestEntity, Length - sizeof(ControlHeader), Protocal); */
}
}
static void TCPSwepOutput(QueryContextEntry *Entry, int Number)
{
ShowTimeOutMassage(Entry -> Agent, Entry -> Type, Entry -> Domain, 'T');
DomainStatistic_Add(Entry -> Domain, &(Entry -> HashValue), STATISTIC_TYPE_REFUSED);
if( Number == 1 )
{
AddressChunk_Advance(&Addresses, DNS_QUARY_PROTOCOL_TCP);
}
}
int QueryDNSViaTCP(void)
{
static QueryContext Context;
SOCKET TCPQueryIncomeSocket;
SOCKET TCPQueryOutcomeSocket;
SOCKET SendBackSocket;
int NumberOfQueryBeforeSwep = 0;
static fd_set ReadSet, ReadySet;
static const struct timeval LongTime = {3600, 0};
static const struct timeval ShortTime = {2, 0};
struct timeval TimeLimit = LongTime;
int MaxFd;
static char RequestEntity[2048];
ControlHeader *Header = (ControlHeader *)RequestEntity;
sa_family_t LastFamily = MAIN_FAMILY;
struct sockaddr *LastAddress = NULL;
TCPQueryIncomeSocket = InternalInterface_TryOpenLocal(10100, INTERNAL_INTERFACE_TCP_QUERY);
TCPQueryOutcomeSocket = socket(MAIN_FAMILY, SOCK_STREAM, IPPROTO_TCP);
SendBackSocket = InternalInterface_GetSocket(INTERNAL_INTERFACE_UDP_INCOME);
if( TCPQueryOutcomeSocket == INVALID_SOCKET )
{
return -1;
}
MaxFd = TCPQueryIncomeSocket > TCPQueryOutcomeSocket ? TCPQueryIncomeSocket : TCPQueryOutcomeSocket;
FD_ZERO(&ReadSet);
FD_ZERO(&ReadySet);
FD_SET(TCPQueryIncomeSocket, &ReadSet);
FD_SET(TCPQueryOutcomeSocket, &ReadSet);
InternalInterface_InitQueryContext(&Context);
while( TRUE )
{
ReadySet = ReadSet;
switch( select(MaxFd + 1, &ReadySet, NULL, NULL, &TimeLimit) )
{
case SOCKET_ERROR:
ERRORMSG("\n\n\n\n\n\n\n\n\n\n");
ERRORMSG(" !!!!! Something bad happend, please restert this program.\n");
while( TRUE ) SLEEP(100000);
break;
case 0:
if( InternalInterface_QueryContextSwep(&Context, 2, TCPSwepOutput) == TRUE )
{
TimeLimit = LongTime;
} else {
TimeLimit = ShortTime;
}
NumberOfQueryBeforeSwep = 0;
break;
default:
TimeLimit = ShortTime;
++NumberOfQueryBeforeSwep;
if( NumberOfQueryBeforeSwep > 1024 )
{
InternalInterface_QueryContextSwep(&Context, 2, TCPSwepOutput);
NumberOfQueryBeforeSwep = 0;
}
if( FD_ISSET(TCPQueryIncomeSocket, &ReadySet) )
{
int State;
sa_family_t NewFamily;
struct sockaddr *NewAddress;
uint16_t TCPLength;
State = recvfrom(TCPQueryIncomeSocket,
RequestEntity,
sizeof(RequestEntity),
0,
NULL,
NULL
);
if( State < 1 )
{
break;
}
GetAddress((ControlHeader *)RequestEntity, DNS_QUARY_PROTOCOL_TCP, &NewAddress, NULL, &NewFamily);
if( NewFamily != LastFamily || NewAddress != LastAddress || TCPSocketIsHealthy(TCPQueryOutcomeSocket) == FALSE )
{
if( TCPQueryOutcomeSocket != INVALID_SOCKET )
{
FD_CLR(TCPQueryOutcomeSocket, &ReadSet);
CLOSE_SOCKET(TCPQueryOutcomeSocket);
}
TCPQueryOutcomeSocket = socket(NewFamily, SOCK_STREAM, IPPROTO_TCP);
if( TCPQueryOutcomeSocket == INVALID_SOCKET )
{
LastFamily = AF_UNSPEC;
break;
}
if( connect(TCPQueryOutcomeSocket, NewAddress, GetAddressLength(NewFamily)) != 0 )
{
AddressChunk_Advance(&Addresses, DNS_QUARY_PROTOCOL_TCP);
break;
}
LastFamily = NewFamily;
LastAddress = NewAddress;
if( TCPQueryOutcomeSocket > MaxFd )
{
MaxFd = TCPQueryOutcomeSocket;
}
FD_SET(TCPQueryOutcomeSocket, &ReadSet);
INFO("TCP connection to server established.\n");
}
InternalInterface_QueryContextAddUDP(&Context, Header);
TCPLength = htons(State - sizeof(ControlHeader));
send(TCPQueryOutcomeSocket, (const char *)&TCPLength, 2, MSG_NOSIGNAL);
send(TCPQueryOutcomeSocket, RequestEntity + sizeof(ControlHeader), State - sizeof(ControlHeader), MSG_NOSIGNAL);
} else {
int State;
uint16_t TCPLength;
if( recv(TCPQueryOutcomeSocket, (char *)&TCPLength, 2, MSG_NOSIGNAL) < 2 )
{
CloseTCPConnection(TCPQueryOutcomeSocket);
FD_CLR(TCPQueryOutcomeSocket, &ReadSet);
INFO("Lost TCP connection to server.\n");
break;
}
TCPLength = ntohs(TCPLength);
if( TCPLength > sizeof(RequestEntity) - sizeof(ControlHeader) )
{
ClearTCPSocketBuffer(TCPQueryOutcomeSocket, TCPLength);
break;
}
State = recv(TCPQueryOutcomeSocket,
RequestEntity + sizeof(ControlHeader),
TCPLength,
MSG_NOSIGNAL
);
if( State != TCPLength )
{
CloseTCPConnection(TCPQueryOutcomeSocket);
FD_CLR(TCPQueryOutcomeSocket, &ReadSet);
break;
}
SendBack(SendBackSocket, Header, &Context, State + sizeof(ControlHeader), 'T', STATISTIC_TYPE_TCP, FALSE);
}
}
}
}
int InitBlockedIP(StringList *l)
{
const char *Itr = NULL;
uint32_t Ip;
if( l == NULL )
{
return 0;
}
if( IPMiscellaneous == NULL )
{
IPMiscellaneous = SafeMalloc(sizeof(IpChunk));
IpChunk_Init(IPMiscellaneous);
}
Itr = StringList_GetNext(l, NULL);
while( Itr != NULL )
{
IPv4AddressToNum(Itr, &Ip);
IpChunk_Add(IPMiscellaneous, Ip, IP_MISCELLANEOUS_TYPE_BLOCK, NULL, 0);
Itr = StringList_GetNext(l, Itr);
}
StringList_Free(l);
return 0;
}
int InitIPSubstituting(StringList *l)
{
const char *Itr = NULL;
char Origin_Str[] = "xxx.xxx.xxx.xxx";
char Substituted_Str[] = "xxx.xxx.xxx.xxx";
uint32_t Origin, Substituted;
if( l == NULL )
{
return 0;
}
if( IPMiscellaneous == NULL )
{
IPMiscellaneous = SafeMalloc(sizeof(IpChunk));
IpChunk_Init(IPMiscellaneous);
}
Itr = StringList_GetNext(l, NULL);
while( Itr != NULL )
{
sscanf(Itr, "%s %s", Origin_Str, Substituted_Str);
IPv4AddressToNum(Origin_Str, &Origin);
IPv4AddressToNum(Substituted_Str, &Substituted);
IpChunk_Add(IPMiscellaneous, Origin, IP_MISCELLANEOUS_TYPE_SUBSTITUTE, (const char *)&Substituted, 4);
Itr = StringList_GetNext(l, Itr);
}
StringList_Free(l);
return 0;
}
static void SendQueryViaUDP(SOCKET Socket,
const char *RequestEntity,
int EntityLength,
struct sockaddr *Addresses_List,
int NumberOfAddresses,
sa_family_t Family
)
{
int AddrLen = GetAddressLength(Family);
int StateOfSending = 0;
while( NumberOfAddresses != 0 )
{
StateOfSending |= (sendto(Socket, RequestEntity, EntityLength, 0, Addresses_List, AddrLen) > 0);
Addresses_List = (struct sockaddr *)(((char *)Addresses_List) + AddrLen);
--NumberOfAddresses;
}
}
static void UDPSwepOutput(QueryContextEntry *Entry, int Number)
{
ShowTimeOutMassage(Entry -> Agent, Entry -> Type, Entry -> Domain, 'U');
DomainStatistic_Add(Entry -> Domain, &(Entry -> HashValue), STATISTIC_TYPE_REFUSED);
if( Number == 1 && ParallelQuery == FALSE )
{
AddressChunk_Advance(&Addresses, DNS_QUARY_PROTOCOL_UDP);
}
}
int QueryDNSViaUDP(void)
{
static QueryContext Context;
SOCKET UDPQueryIncomeSocket;
SOCKET UDPQueryOutcomeSocket;
SOCKET SendBackSocket;
int NumberOfQueryBeforeSwep = 0;
static fd_set ReadSet, ReadySet;
static const struct timeval LongTime = {3600, 0};
static const struct timeval ShortTime = {2, 0};
struct timeval TimeLimit = LongTime;
int MaxFd;
sa_family_t LastFamily = ParallelMainFamily;
static char RequestEntity[2048];
ControlHeader *Header = (ControlHeader *)RequestEntity;
UDPQueryIncomeSocket = InternalInterface_TryOpenLocal(10125, INTERNAL_INTERFACE_UDP_QUERY);
UDPQueryOutcomeSocket = InternalInterface_OpenASocket(ParallelMainFamily, NULL);
SendBackSocket = InternalInterface_GetSocket(INTERNAL_INTERFACE_UDP_INCOME);
if( UDPQueryOutcomeSocket == INVALID_SOCKET )
{
return -1;
}
MaxFd = UDPQueryIncomeSocket > UDPQueryOutcomeSocket ? UDPQueryIncomeSocket : UDPQueryOutcomeSocket;
FD_ZERO(&ReadSet);
FD_ZERO(&ReadySet);
FD_SET(UDPQueryIncomeSocket, &ReadSet);
FD_SET(UDPQueryOutcomeSocket, &ReadSet);
InternalInterface_InitQueryContext(&Context);
while( TRUE )
{
ReadySet = ReadSet;
switch( select(MaxFd + 1, &ReadySet, NULL, NULL, &TimeLimit) )
{
case SOCKET_ERROR:
ERRORMSG("\n\n\n\n\n\n\n\n\n\n");
ERRORMSG(" !!!!! Something bad happend, please restert this program.\n");
while( TRUE ) SLEEP(100000);
break;
case 0:
if( InternalInterface_QueryContextSwep(&Context, 2, UDPSwepOutput) == TRUE )
{
TimeLimit = LongTime;
} else {
TimeLimit = ShortTime;
}
NumberOfQueryBeforeSwep = 0;
break;
default:
TimeLimit = ShortTime;
++NumberOfQueryBeforeSwep;
if( NumberOfQueryBeforeSwep > 1024 )
{
InternalInterface_QueryContextSwep(&Context, 2, UDPSwepOutput);
NumberOfQueryBeforeSwep = 0;
}
if( FD_ISSET(UDPQueryIncomeSocket, &ReadySet) )
{
int State;
struct sockaddr *NewAddress;
int NumberOfAddresses;
sa_family_t NewFamily;
State = recvfrom(UDPQueryIncomeSocket,
RequestEntity,
sizeof(RequestEntity),
0,
NULL,
NULL
);
if( State < 1 )
{
break;
}
if( UDPAppendEDNSOpt == TRUE && DNSGetAdditionalCount(RequestEntity + sizeof(ControlHeader)) == 0 )
{
memcpy(RequestEntity + State, OptPseudoRecord, OPT_PSEUDORECORD_LENGTH);
DNSSetAdditionalCount(RequestEntity + sizeof(ControlHeader), 1);
State += OPT_PSEUDORECORD_LENGTH;
}
InternalInterface_QueryContextAddUDP(&Context, Header);
GetAddress((ControlHeader *)RequestEntity, DNS_QUARY_PROTOCOL_UDP, &NewAddress, &NumberOfAddresses, &NewFamily);
if( NewFamily != LastFamily )
{
if( UDPQueryOutcomeSocket != INVALID_SOCKET )
{
FD_CLR(UDPQueryOutcomeSocket, &ReadSet);
CLOSE_SOCKET(UDPQueryOutcomeSocket);
}
UDPQueryOutcomeSocket = InternalInterface_OpenASocket(NewFamily, NULL);
if( UDPQueryOutcomeSocket == INVALID_SOCKET )
{
LastFamily = AF_UNSPEC;
break;
}
LastFamily = NewFamily;
if( UDPQueryOutcomeSocket > MaxFd )
{
MaxFd = UDPQueryOutcomeSocket;
}
FD_SET(UDPQueryOutcomeSocket, &ReadSet);
}
SendQueryViaUDP(UDPQueryOutcomeSocket,
RequestEntity + sizeof(ControlHeader),
State - sizeof(ControlHeader),
NewAddress,
NumberOfAddresses,
NewFamily
);
} else {
int State;
State = recvfrom(UDPQueryOutcomeSocket,
RequestEntity + sizeof(ControlHeader),
sizeof(RequestEntity) - sizeof(ControlHeader),
0,
NULL,
NULL
);
if( State < 1 )
{
break;
}
SendBack(SendBackSocket, Header, &Context, State + sizeof(ControlHeader), 'U', STATISTIC_TYPE_UDP, UDPAntiPollution);
}
break;
}
}
}
int ProbeFakeAddresses(const char *ServerAddress,
const char *RequestingDomain,
StringList *out
)
{
char RequestEntity[384] = {
00, 00, /* QueryIdentifier */
01, 00, /* Flags */
00, 01, /* QuestionCount */
00, 00, /* AnswerCount */
00, 00, /* NameServerCount */
00, 00, /* AdditionalCount */
/* Header end */
};
struct sockaddr_in PeerAddr;
SOCKET Sock;
int NumberOfAddresses = 0;
int RequestLength;
int AddrLen = sizeof(struct sockaddr);
char NewlyReceived[2048];
if( DNSGenQuestionRecord(RequestEntity + 12, sizeof(RequestEntity) - 12, RequestingDomain, DNS_TYPE_NS, DNS_CLASS_IN) == 0 )
{
return -1;
}
FILL_ADDR4(PeerAddr, AF_INET, ServerAddress, 53);
Sock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
if( Sock == INVALID_SOCKET )
{
return -1;
}
SetSocketRecvTimeLimit(Sock, 2000);
RequestLength = 12 + strlen(RequestingDomain) + 2 + 4;
*(uint16_t *)RequestEntity = rand();
if( sendto(Sock, RequestEntity, RequestLength, 0, (struct sockaddr *)&PeerAddr, AddrLen) == 0 )
{
CLOSE_SOCKET(Sock);
return -1;
}
while( TRUE )
{
if( recvfrom(Sock, NewlyReceived, sizeof(NewlyReceived), 0, NULL, NULL) <= 0 )
{
break;
}
if( *(uint16_t *)RequestEntity != *(uint16_t *)NewlyReceived )
{
continue;
}
if( ((DNSHeader *)NewlyReceived) -> Flags.ResponseCode != 0 )
{
continue;
}
if( DNSGetAnswerCount(NewlyReceived) > 0 )
{
const char *FirstAnswer;
FirstAnswer = DNSGetAnswerRecordPosition(NewlyReceived, 1);
if( DNSGetRecordType(FirstAnswer) == DNS_TYPE_A )
{
NumberOfAddresses += GetHostsByRaw(NewlyReceived, out);
continue;
} else {
break;
}
}
if( DNSGetNameServerCount(NewlyReceived) == 0 && DNSGetAdditionalCount(NewlyReceived) == 0 )
{
continue;
}
break;
}
ClearSocketBuffer(Sock);
CLOSE_SOCKET(Sock);
return NumberOfAddresses;
}
int TestServer(struct TestServerArguments *Args)
{
const char *RequestingDomain = "www.google.com";
char RequestEntity[384] = {
00, 00, /* QueryIdentifier */
01, 00, /* Flags */
00, 01, /* QuestionCount */
00, 00, /* AnswerCount */
00, 00, /* NameServerCount */
00, 00, /* AdditionalCount */
/* Header end */
};
Address_Type PeerAddr;
SOCKET Sock;
sa_family_t AddressFamily;
int RequestLength;
char NewlyReceived[2048];
Args -> ServerAddress = GoToNextNonSpace(Args -> ServerAddress);
if( strchr(Args -> ServerAddress, ':') != NULL && *(Args -> ServerAddress) != '[' )
{
char ServerAddress_Regulated[LENGTH_OF_IPV6_ADDRESS_ASCII + 3];
sprintf(ServerAddress_Regulated, "[%s]", Args -> ServerAddress);
AddressFamily = AddressList_ConvertToAddressFromString(&PeerAddr, ServerAddress_Regulated, 53);
} else {
AddressFamily = AddressList_ConvertToAddressFromString(&PeerAddr, Args -> ServerAddress, 53);
}
if( AddressFamily == AF_UNSPEC )
{
return -1;
}
Sock = socket(AddressFamily, SOCK_DGRAM, IPPROTO_UDP);
if( Sock == INVALID_SOCKET )
{
return -1;
}
SetSocketRecvTimeLimit(Sock, 2000);
if( DNSGenQuestionRecord(RequestEntity + 12, sizeof(RequestEntity) - 12, RequestingDomain, DNS_TYPE_A, DNS_CLASS_IN) == 0 )
{
return -1;
}
RequestLength = 12 + strlen(RequestingDomain) + 2 + 4;