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newlib-cygwin/winsup/cygwin/libc/minires-os-if.c

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/* minires-os-if.c. Stub synchronous resolver for Cygwin.
Written by Pierre A. Humblet <Pierre.Humblet@ieee.org>
This file is part of Cygwin.
This software is a copyrighted work licensed under the terms of the
Cygwin license. Please consult the file "CYGWIN_LICENSE" for
details. */
#define __INSIDE_CYGWIN_NET__
#define USE_SYS_TYPES_FD_SET
#include <winsup.h>
#include <ws2tcpip.h>
#include <iphlpapi.h>
#include <windns.h>
#include "ntdll.h"
#undef h_errno
#include "minires.h"
#ifdef __CYGWIN__
/***********************************************************************
*
Windows interface code
***********************************************************************/
/* Conflict between Windows definitions and others */
#undef ERROR
#undef NOERROR
#undef DELETE
/***********************************************************************
* write_record: Translates a Windows DNS record into a compressed record
***********************************************************************/
#define PUTDOMAIN(d,p)\
{int res = dn_comp(d, p, EndPtr - p, dnptrs, lastdnptr); p += res < 0 ? (int) strlen(d) : res; }
static unsigned char * write_record(unsigned char * ptr, PDNS_RECORD rr,
unsigned char * EndPtr,
unsigned char ** dnptrs,
unsigned char ** lastdnptr, int debug)
{
unsigned char * rd_length_ptr;
PUTDOMAIN(rr->pName, ptr);
if (ptr + 4 > EndPtr)
ptr += 4;
else {
PUTSHORT(rr->wType, ptr);
PUTSHORT(ns_c_in, ptr);
}
if ((rr->Flags.DW & 0x3) == DnsSectionQuestion)
return ptr;
if (ptr + 4 > EndPtr)
ptr += 4;
else {
PUTLONG(rr->dwTtl, ptr);
}
rd_length_ptr = ptr;
ptr += 2; /* Placeholder for RDLENGTH */
/* The default case uses an undocumented feature of the Windows
resolver for types greater than 16.
The DNS_RECORD Data contains the record in wire format. */
switch(rr->wType) {
case DNS_TYPE_A:
case DNS_TYPE_AAAA:
{
u_int8_t * aptr = rr->wType == DNS_TYPE_A
? (u_int8_t *) & rr->Data.A.IpAddress : (u_int8_t *) & rr->Data.AAAA.Ip6Address;
int sz = rr->wType == DNS_TYPE_A ? NS_INADDRSZ/*4*/ : NS_IN6ADDRSZ/*16*/;
if (ptr + sz <= EndPtr)
memcpy(ptr, aptr, sz);
ptr += sz;
break;
}
case DNS_TYPE_NS:
case DNS_TYPE_MD:
case DNS_TYPE_MF:
case DNS_TYPE_CNAME:
case DNS_TYPE_MB:
case DNS_TYPE_MG:
case DNS_TYPE_MR:
case DNS_TYPE_PTR:
PUTDOMAIN(rr->Data.PTR.pNameHost, ptr);
break;
case DNS_TYPE_SOA:
PUTDOMAIN(rr->Data.SOA.pNamePrimaryServer, ptr);
PUTDOMAIN(rr->Data.SOA.pNameAdministrator, ptr);
if (ptr + 20 > EndPtr)
ptr += 20;
else {
PUTLONG(rr->Data.SOA.dwSerialNo, ptr);
PUTLONG(rr->Data.SOA.dwRefresh, ptr);
PUTLONG(rr->Data.SOA.dwRetry, ptr);
PUTLONG(rr->Data.SOA.dwExpire, ptr);
PUTLONG(rr->Data.SOA.dwDefaultTtl, ptr);
}
break;
case DNS_TYPE_NULL:
if (ptr + rr->Data.Null.dwByteCount <= EndPtr)
memcpy(ptr, rr->Data.Null.Data, rr->Data.Null.dwByteCount);
ptr += rr->Data.Null.dwByteCount;
if (rr->Data.Null.dwByteCount == rr->wDataLength - sizeof(DNS_NULL_DATA) + 1)
DPRINTF(debug, "Null byte count has an unexpected value\n");
break;
case DNS_TYPE_WKS:
if (ptr + rr->wDataLength - sizeof(DNS_WKS_DATA) + 1 + 5 > EndPtr)
ptr += rr->wDataLength - sizeof(DNS_WKS_DATA) + 1 + 5;
else {
PUTLONG(rr->Data.WKS.IpAddress, ptr);
*ptr++ = rr->Data.WKS.chProtocol;
memcpy(ptr, rr->Data.WKS.BitMask, rr->wDataLength - sizeof(DNS_WKS_DATA) + 1);
ptr += rr->wDataLength - sizeof(DNS_WKS_DATA) + 1;
}
break;
case DNS_TYPE_MINFO:
case DNS_TYPE_RP:
PUTDOMAIN(rr->Data.MINFO.pNameMailbox, ptr);
PUTDOMAIN(rr->Data.MINFO.pNameErrorsMailbox, ptr);
break;
case DNS_TYPE_MX:
case DNS_TYPE_AFSDB:
case DNS_TYPE_RT:
if (ptr + 2 > EndPtr)
ptr += 2;
else
PUTSHORT(rr->Data.MX.wPreference, ptr);
PUTDOMAIN(rr->Data.MX.pNameExchange, ptr);
break;
case DNS_TYPE_HINFO:
case DNS_TYPE_ISDN:
case DNS_TYPE_TEXT:
case DNS_TYPE_X25:
{
unsigned int i, len;
for (i = 0; i < rr->Data.TXT.dwStringCount; i++) {
len = strlen(rr->Data.TXT.pStringArray[i]) & 0xFF;
if (ptr + len + 1 > EndPtr)
ptr += len + 1;
else {
*ptr++ = len;
memcpy(ptr, rr->Data.TXT.pStringArray[i], len);
ptr += len;
}
}
break;
}
case DNS_TYPE_SRV:
if (ptr + 6 > EndPtr)
ptr += 6;
else {
PUTSHORT(rr->Data.SRV.wPriority, ptr);
PUTSHORT(rr->Data.SRV.wWeight, ptr);
PUTSHORT(rr->Data.SRV.wPort, ptr);
}
dnptrs = 0; /* compression not allowed */
PUTDOMAIN(rr->Data.SRV.pNameTarget, ptr);
break;
default:
{
unsigned int len = rr->wDataLength;
DPRINTF(debug, "No structure for wType %u\n", rr->wType);
if (ptr + len <= EndPtr)
memcpy(ptr, (char *) &rr->Data, len);
ptr += len;
break;
}
}
if (rd_length_ptr + 2 <= EndPtr)
PUTSHORT(ptr - rd_length_ptr - 2, rd_length_ptr);
return ptr;
}
/***********************************************************************
*
cygwin_query: implements res_nquery by calling DnsQuery
***********************************************************************/
static int cygwin_query(res_state statp, const char * DomName, int Class, int Type,
unsigned char * AnsPtr, int AnsLength)
{
DNS_STATUS res;
PDNS_RECORD pQueryResultsSet, rr;
DWORD section;
int len, counts[4] = {0, 0, 0, 0}, debug = statp->options & RES_DEBUG;
unsigned char * dnptrs[256], * ptr;
unsigned short Id = 0;
dnptrs[0] = AnsPtr;
dnptrs[1] = NULL;
if (AnsLength >= 2)
memcpy(&Id, AnsPtr, 2);
memset(AnsPtr, 0, AnsLength);
if (Class != ns_c_in) {
errno = ENOSYS;
statp->res_h_errno = NETDB_INTERNAL;
return -1;
}
res = DnsQuery_A(DomName, Type, DNS_QUERY_TREAT_AS_FQDN,
NULL, &pQueryResultsSet, NULL);
#if 0
#define NETDB_INTERNAL -1 /* see errno */
#define HOST_NOT_FOUND 1 /* Authoritative Answer Host not found */
#define TRY_AGAIN 2 /* Non-Authoritive Host not found, or SERVERFAIL */
#define NO_RECOVERY 3 /* Non recoverable errors, FORMERR, REFUSED, NOTIMP */
#define NO_DATA 4 /* Valid name, no data record of requested type */
#endif
DPRINTF(debug, "DnsQuery for \"%s\" %d: %u (Windows)\n", DomName, Type, res);
if (res) {
switch (res) {
case ERROR_INVALID_NAME:
errno = EINVAL;
statp->res_h_errno = NETDB_INTERNAL;
break;
case ERROR_TIMEOUT:
statp->res_h_errno = TRY_AGAIN;
break;
case DNS_ERROR_RCODE_NAME_ERROR:
statp->res_h_errno = HOST_NOT_FOUND;
break;
case DNS_ERROR_RCODE_SERVER_FAILURE:
statp->res_h_errno = TRY_AGAIN;
break;
case DNS_ERROR_NO_DNS_SERVERS:
case DNS_ERROR_RCODE_FORMAT_ERROR:
case DNS_ERROR_RCODE_NOT_IMPLEMENTED:
case DNS_ERROR_RCODE_REFUSED:
statp->res_h_errno = NO_RECOVERY;
break;
case DNS_INFO_NO_RECORDS: /* May be returned even if the host doesn't exist */
statp->res_h_errno = NO_DATA;
break;
default:
DPRINTF(debug, "Unknown code %u\n", res);
statp->res_h_errno = NO_RECOVERY;
break;
}
return -1;
}
ptr = AnsPtr + HFIXEDSZ; /* Skip header */
rr = pQueryResultsSet;
section = 0;
while (rr) {
/* Some Windows versions return questions when providing locally generated
answers, for example for "localhost" or for the computer name. */
if (((rr->Flags.DW & 0x3) == DnsSectionQuestion) &&
(rr->wDataLength > 0)) {
DPRINTF(debug, "Changing record below from question to answer\n");
rr->Flags.DW ^= DnsSectionQuestion ^ DnsSectionAnswer;
}
if (!counts[0] && (rr->Flags.DW & 0x3)) {
/* No question. Adopt the first name as the name in the question */
if ((len = dn_comp(rr->pName, ptr, AnsLength - 4,
dnptrs, &dnptrs[DIM(dnptrs) - 1])) < 0) {
statp->res_h_errno = NETDB_INTERNAL; /* dn_comp sets errno */
AnsLength = 0;
len = -1;
goto done;
}
ptr += len;
PUTSHORT(Type, ptr);
PUTSHORT(ns_c_in, ptr);
counts[0] = 1;
}
DPRINTF(debug, "%s Section %d Type %u Windows Record Length %u\n",
rr->pName, rr->Flags.DW & 0x3, rr->wType, rr->wDataLength);
/* Check the records are in correct section order */
if ((rr->Flags.DW & 0x3) < section) {
DPRINTF(debug, "Unexpected section order for \"%s\" %d\n", DomName, Type);
continue;
}
section = rr->Flags.DW & 0x3;
ptr = write_record(ptr, rr, AnsPtr + AnsLength, dnptrs,
&dnptrs[DIM(dnptrs) - 1], debug);
counts[section]++;
rr = rr->pNext;
}
len = ptr - AnsPtr;
done:
DnsFree(pQueryResultsSet, DnsFreeRecordList);
if (HFIXEDSZ <= AnsLength) {
ptr = AnsPtr;
PUTSHORT(Id, ptr);
PUTSHORT((QR << 8) + RA + RD, ptr);
for (section = 0; section < DIM(counts); section++) {
PUTSHORT(counts[section], ptr);
}
}
return len;
}
/***********************************************************************
*
get_registry_items: returns dns items from the registry
in: Unicode representation of registry value "value".
what: 0 addresses ; 1 search list
***********************************************************************/
static void get_registry_dns_items(PUNICODE_STRING in, res_state statp,
int what)
{
int debug = statp->options & RES_DEBUG;
if (in->Length) {
char list[in->Length];
size_t size = wcstombs (list, in->Buffer, in->Length);
if (what == 0) { /* Get the addresses */
char *ap, *srch;
size_t numAddresses = 0;
for (ap = list; ap < list + size && *ap; ap = srch) {
/* The separation character can be 0, ' ', or ','. */
for (srch = ap; *srch && (isdigit((unsigned) *srch) || *srch == '.' );
srch++);
*srch++ = 0;
if (numAddresses < DIM(statp->nsaddr_list)) {
DPRINTF(debug, "registry server \"%s\"\n", ap);
statp->nsaddr_list[numAddresses].sin_addr.s_addr = cygwin_inet_addr((char *) ap);
if ( statp->nsaddr_list[numAddresses].sin_addr.s_addr != 0 )
numAddresses++;
}
else
DPRINTF(debug, "no space for server \"%s\"\n", ap);
}
statp->nscount = numAddresses;
}
else /* Parse the search line */
minires_get_search(list, statp);
}
return;
}
/***********************************************************************
*
get_registry_dns:
Read the registry to get dns server addresses in Network Byte Order,
and set statp->nscount (for NT <= 4.0)
Read the registry SearchList
***********************************************************************/
static void get_registry_dns(res_state statp)
{
NTSTATUS status;
const PCWSTR keyName = L"Tcpip\\Parameters";
DPRINTF(statp->options & RES_DEBUG, "key \"%ls\"\n", keyName);
status = RtlCheckRegistryKey (RTL_REGISTRY_SERVICES, keyName);
if (!NT_SUCCESS (status))
{
DPRINTF (statp->options & RES_DEBUG, "RtlCheckRegistryKey: status 0x%08X\n",
status);
return;
}
UNICODE_STRING uns = { 0, 0, NULL };
UNICODE_STRING udns = { 0, 0, NULL };
UNICODE_STRING usl = { 0, 0, NULL };
RTL_QUERY_REGISTRY_TABLE tab[4] = {
{ NULL, RTL_QUERY_REGISTRY_DIRECT | RTL_QUERY_REGISTRY_NOEXPAND,
L"NameServer", &uns, REG_NONE, NULL, 0 },
{ NULL, RTL_QUERY_REGISTRY_DIRECT | RTL_QUERY_REGISTRY_NOEXPAND,
L"DhcpNameServer", &udns, REG_NONE, NULL, 0 },
{ NULL, RTL_QUERY_REGISTRY_DIRECT | RTL_QUERY_REGISTRY_NOEXPAND,
L"SearchList", &usl, REG_NONE, NULL, 0 },
};
status = RtlQueryRegistryValues (RTL_REGISTRY_SERVICES, keyName, tab,
NULL, NULL);
if (!NT_SUCCESS (status))
{
DPRINTF (statp->options & RES_DEBUG,
"RtlQueryRegistryValues: status 0x%08X\n", status);
return;
}
if (statp->nscount == 0)
get_registry_dns_items(&uns, statp, 0);
if (statp->nscount == 0)
get_registry_dns_items(&udns, statp, 0);
if (statp->dnsrch[0] == NULL)
get_registry_dns_items(&usl, statp, 1);
if (uns.Buffer)
RtlFreeUnicodeString (&uns);
if (udns.Buffer)
RtlFreeUnicodeString (&udns);
if (usl.Buffer)
RtlFreeUnicodeString (&usl);
return;
}
/***********************************************************************
*
get_dns_info: Get the search list or the domain name
and the dns server addresses in Network Byte Order
Set statp->os_query if DnsQuery is available.
***********************************************************************/
void get_dns_info(res_state statp)
{
#if MAX_HOSTNAME_LEN > MAXHOSTNAMELEN
#define MAX_HOSTNAME_SIZE (MAX_HOSTNAME_LEN + 1)
#else
#define MAX_HOSTNAME_SIZE (MAXHOSTNAMELEN + 1)
#endif
#if MAX_HOSTNAME_SIZE > 256 /* sizeof(defdname) */
#error stap->defdname too short
#endif
int res, debug = statp->options & RES_DEBUG;
ULONG ulOutBufLen = 0;
DWORD dwRetVal;
IP_ADDR_STRING * pIPAddr;
FIXED_INFO * pFixedInfo;
size_t numAddresses = 0;
if (statp->use_os)
{
DPRINTF(debug, "using dnsapi.dll\n");
statp->os_query = (typeof(statp->os_query)) cygwin_query;
/* We just need the search list. Avoid loading iphlpapi. */
statp->nscount = -1;
}
if (statp->nscount != 0)
goto use_registry;
/* First call to get the buffer length we need */
dwRetVal = GetNetworkParams((FIXED_INFO *) 0, &ulOutBufLen);
if (dwRetVal != ERROR_BUFFER_OVERFLOW) {
DPRINTF(debug, "GetNetworkParams: error %u (Windows)\n", dwRetVal);
goto use_registry;
}
if ((pFixedInfo = (FIXED_INFO *) alloca(ulOutBufLen)) == 0) {
DPRINTF(debug, "alloca: %s\n", strerror(errno));
goto use_registry;
}
if ((dwRetVal = GetNetworkParams(pFixedInfo, & ulOutBufLen))) {
DPRINTF(debug, "GetNetworkParams: error %u (Windows)\n", dwRetVal);
goto use_registry;
}
DPRINTF(debug, "GetNetworkParams: OK\n");
/* Record server addresses, up to array size */
for (pIPAddr = &(pFixedInfo->DnsServerList), numAddresses = 0;
pIPAddr;
pIPAddr = pIPAddr->Next) {
if (numAddresses < DIM(statp->nsaddr_list)) {
DPRINTF(debug, "params server \"%s\"\n", pIPAddr->IpAddress.String);
statp->nsaddr_list[numAddresses].sin_addr.s_addr = cygwin_inet_addr(pIPAddr->IpAddress.String);
if (statp->nsaddr_list[numAddresses].sin_addr.s_addr != 0) {
numAddresses++;
statp->nscount++;
}
}
else
DPRINTF(debug, "no space for server \"%s\"\n", pIPAddr->IpAddress.String);
}
use_registry:
get_registry_dns(statp);
if (!statp->dnsrch[0]) {
statp->defdname[sizeof(statp->defdname) - 1] = 0;
if (!(res = getdomainname(statp->defdname, sizeof(statp->defdname)))) {
if (statp->defdname[0] && !statp->defdname[sizeof(statp->defdname) - 1])
statp->dnsrch[0] = statp->defdname;
}
DPRINTF(debug, "getdomainname \"%s\"\n",
(res)? strerror(errno) : statp->defdname);
}
}
#else
/***********************************************************************
*
Default interface code
***********************************************************************/
void get_dns_info(res_state statp)
{
return;
}
#endif
#if 0
#define DNS_ERROR_RCODE_FORMAT_ERROR 9001L
#define DNS_ERROR_RCODE_SERVER_FAILURE 9002L
#define DNS_ERROR_RCODE_NAME_ERROR 9003L
#define DNS_ERROR_RCODE_NOT_IMPLEMENTED 9004L
#define DNS_ERROR_RCODE_REFUSED 9005L
#define DNS_ERROR_RCODE_YXDOMAIN 9006L
#define DNS_ERROR_RCODE_YXRRSET 9007L
#define DNS_ERROR_RCODE_NXRRSET 9008L
#define DNS_ERROR_RCODE_NOTAUTH 9009L
#define DNS_ERROR_RCODE_NOTZONE 9010L
#define DNS_ERROR_RCODE_BADSIG 9016L
#define DNS_ERROR_RCODE_BADKEY 9017L
#define DNS_ERROR_RCODE_BADTIME 9018L
#define DNS_INFO_NO_RECORDS 9501L
#define DNS_ERROR_BAD_PACKET 9502L
#define DNS_ERROR_NO_PACKET 9503L
#define DNS_ERROR_RCODE 9504L
#define DNS_ERROR_UNSECURE_PACKET 9505L
#define DNS_ERROR_INVALID_TYPE 9551L
#define DNS_ERROR_INVALID_IP_ADDRESS 9552L
#define DNS_ERROR_INVALID_PROPERTY 9553L
#define DNS_ERROR_TRY_AGAIN_LATER 9554L
#define DNS_ERROR_NOT_UNIQUE 9555L
#define DNS_ERROR_NON_RFC_NAME 9556L
#define DNS_STATUS_FQDN 9557L
#define DNS_STATUS_DOTTED_NAME 9558L
#define DNS_STATUS_SINGLE_PART_NAME 9559L
#define DNS_ERROR_INVALID_NAME_CHAR 9560L
#define DNS_ERROR_NUMERIC_NAME 9561L
#define DNS_ERROR_NOT_LALOWED_ON_ROOT_SERVER 9562L
#define DNS_ERROR_NOT_ALLOWED_UNDER_DELEGATION 9563L
#define DNS_ERROR_CANNOT_FIND_ROOT_HINTS 9564L
#define DNS_ERROR_INCONSISTENT_ROOT_HINTS 9565L
#define DNS_ERROR_ZONE_DOES_NOT_EXIST 9601L
#define DNS_ERROR_NO_ZONE_INFO 9602L
#define DNS_ERROR_INVALID_ZONE_OPERATION 9603L
#define DNS_ERROR_ZONE_CONFIGURATION_ERROR 9604L
#define DNS_ERROR_ZONE_HAS_NO_SOA_RECORD 9605L
#define DNS_ERROR_ZONE_HAS_NO_NS_RECORDS 9606L
#define DNS_ERROR_ZONE_LOCKED 9607L
#define DNS_ERROR_ZONE_CREATION_FAILED 9608L
#define DNS_ERROR_ZONE_ALREADY_EXISTS 9609L
#define DNS_ERROR_AUTOZONE_ALREADY_EXISTS 9610L
#define DNS_ERROR_INVALID_ZONE_TYPE 9611L
#define DNS_ERROR_SECONDARY_REQUIRES_MASTER_IP 9612L
#define DNS_ERROR_ZONE_NOT_SECONDARY 9613L
#define DNS_ERROR_NEED_SECONDARY_ADDRESSES 9614L
#define DNS_ERROR_WINS_INIT_FAILED 9615L
#define DNS_ERROR_NEED_WINS_SERVERS 9616L
#define DNS_ERROR_NBSTAT_INIT_FAILED 9617L
#define DNS_ERROR_SOA_DELETE_INVALID 9618L
#define DNS_ERROR_FORWARDER_ALREADY_EXISTS 9619L
#define DNS_ERROR_ZONE_REQUIRES_MASTER_IP 9620L
#define DNS_ERROR_ZONE_IS_SHUTDOWN 9621L
#define DNS_ERROR_PRIMARY_REQUIRES_DATAFILE 9651L
#define DNS_ERROR_INVALID_DATAFILE_NAME 9652L
#define DNS_ERROR_DATAFILE_OPEN_FAILURE 9653L
#define DNS_ERROR_FILE_WRITEBACK_FAILED 9654L
#define DNS_ERROR_DATAFILE_PARSING 9655L
#define DNS_ERROR_RECORD_DOES_NOT_EXIST 9701L
#define DNS_ERROR_RECORD_FORMAT 9702L
#define DNS_ERROR_NODE_CREATION_FAILED 9703L
#define DNS_ERROR_UNKNOWN_RECORD_TYPE 9704L
#define DNS_ERROR_RECORD_TIMED_OUT 9705L
#define DNS_ERROR_NAME_NOT_IN_ZONE 9706L
#define DNS_ERROR_CNAME_LOOP 9707L
#define DNS_ERROR_NODE_IS_CNAME 9708L
#define DNS_ERROR_CNAME_COLLISION 9709L
#define DNS_ERROR_RECORD_ONLY_AT_ZONE_ROOT 9710L
#define DNS_ERROR_RECORD_ALREADY_EXISTS 9711L
#define DNS_ERROR_SECONDARY_DATA 9712L
#define DNS_ERROR_NO_CREATE_CACHE_DATA 9713L
#define DNS_ERROR_NAME_DOES_NOT_EXIST 9714L
#define DNS_WARNING_PTR_CREATE_FAILED 9715L
#define DNS_WARNING_DOMAIN_UNDELETED 9716L
#define DNS_ERROR_DS_UNAVAILABLE 9717L
#define DNS_ERROR_DS_ZONE_ALREADY_EXISTS 9718L
#define DNS_ERROR_NO_BOOTFILE_IF_DS_ZONE 9719L
#define DNS_INFO_AXFR_COMPLETE 9751L
#define DNS_ERROR_AXFR 9752L
#define DNS_INFO_ADDED_LOCAL_WINS 9753L
#define DNS_STATUS_CONTINUE_NEEDED 9801L
#define DNS_ERROR_NO_TCPIP 9851L
#define DNS_ERROR_NO_DNS_SERVERS 9852L
#define DNS_ERROR_DP_DOES_NOT_EXIST 9901L
#define DNS_ERROR_DP_ALREADY_EXISTS 9902L
#define DNS_ERROR_DP_NOT_ENLISTED 9903L
#define DNS_ERROR_DP_ALREADY_ENLISTED 9904L
#define DNS_ERROR_DP_NOT_AVAILABLE 9905L
#endif
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