586 lines
18 KiB
C
586 lines
18 KiB
C
/* minires-os-if.c. Stub synchronous resolver for Cygwin.
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Copyright 2006, 2007, 2008, 2009, 2011 Red Hat, Inc.
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Written by Pierre A. Humblet <Pierre.Humblet@ieee.org>
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This file is part of Cygwin.
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This software is a copyrighted work licensed under the terms of the
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Cygwin license. Please consult the file "CYGWIN_LICENSE" for
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details. */
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#include "minires.h"
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#ifdef __CYGWIN__
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/***********************************************************************
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*
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Windows interface code
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***********************************************************************/
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/* Conflict between Windows definitions and others */
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#undef ERROR
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#undef NOERROR
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#undef DELETE
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#include <windows.h>
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#include <iphlpapi.h>
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#include <windns.h>
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#include <ntdef.h>
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#include "ntdll.h"
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#include <wchar.h>
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/***********************************************************************
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* write_record: Translates a Windows DNS record into a compressed record
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***********************************************************************/
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#define PUTDOMAIN(d,p)\
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{int res = dn_comp(d, p, EndPtr - p, dnptrs, lastdnptr); p += res < 0 ? strlen(d) : res; }
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static u_char * write_record(unsigned char * ptr, PDNS_RECORD rr, unsigned char * EndPtr,
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unsigned char ** dnptrs, unsigned char ** lastdnptr, int debug)
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{
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u_char * rd_length_ptr;
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PUTDOMAIN(rr->pName, ptr);
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if (ptr + 4 > EndPtr)
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ptr += 4;
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else {
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PUTSHORT(rr->wType, ptr);
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PUTSHORT(ns_c_in, ptr);
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}
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if ((rr->Flags.DW & 0x3) == DnsSectionQuestion)
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return ptr;
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if (ptr + 4 > EndPtr)
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ptr += 4;
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else {
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PUTLONG(rr->dwTtl, ptr);
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}
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rd_length_ptr = ptr;
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ptr += 2; /* Placeholder for RDLENGTH */
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/* The default case uses an undocumented feature of the Windows
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resolver for types greater than 16.
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The DNS_RECORD Data contains the record in wire format. */
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switch(rr->wType) {
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case DNS_TYPE_A:
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{
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u_char * aptr = (u_char *) & rr->Data.A.IpAddress;
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if (ptr + 4 <= EndPtr) {
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ptr[0] = aptr[0];
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ptr[1] = aptr[1];
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ptr[2] = aptr[2];
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ptr[3] = aptr[3];
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}
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ptr += 4;
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break;
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}
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case DNS_TYPE_NS:
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case DNS_TYPE_MD:
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case DNS_TYPE_MF:
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case DNS_TYPE_CNAME:
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case DNS_TYPE_MB:
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case DNS_TYPE_MG:
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case DNS_TYPE_MR:
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case DNS_TYPE_PTR:
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PUTDOMAIN(rr->Data.PTR.pNameHost, ptr);
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break;
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case DNS_TYPE_SOA:
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PUTDOMAIN(rr->Data.SOA.pNamePrimaryServer, ptr);
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PUTDOMAIN(rr->Data.SOA.pNameAdministrator, ptr);
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if (ptr + 20 > EndPtr)
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ptr += 20;
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else {
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PUTLONG(rr->Data.SOA.dwSerialNo, ptr);
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PUTLONG(rr->Data.SOA.dwRefresh, ptr);
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PUTLONG(rr->Data.SOA.dwRetry, ptr);
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PUTLONG(rr->Data.SOA.dwExpire, ptr);
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PUTLONG(rr->Data.SOA.dwDefaultTtl, ptr);
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}
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break;
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case DNS_TYPE_NULL:
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if (ptr + rr->Data.Null.dwByteCount <= EndPtr)
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memcpy(ptr, rr->Data.Null.Data, rr->Data.Null.dwByteCount);
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ptr += rr->Data.Null.dwByteCount;
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if (rr->Data.Null.dwByteCount == rr->wDataLength - sizeof(DNS_NULL_DATA) + 1)
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DPRINTF(debug, "Null byte count has an unexpected value\n");
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break;
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case DNS_TYPE_WKS:
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if (ptr + rr->wDataLength - sizeof(DNS_WKS_DATA) + 1 + 5 > EndPtr)
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ptr += rr->wDataLength - sizeof(DNS_WKS_DATA) + 1 + 5;
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else {
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PUTLONG(rr->Data.WKS.IpAddress, ptr);
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*ptr++ = rr->Data.WKS.chProtocol;
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memcpy(ptr, rr->Data.WKS.BitMask, rr->wDataLength - sizeof(DNS_WKS_DATA) + 1);
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ptr += rr->wDataLength - sizeof(DNS_WKS_DATA) + 1;
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}
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break;
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case DNS_TYPE_MINFO:
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case DNS_TYPE_RP:
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PUTDOMAIN(rr->Data.MINFO.pNameMailbox, ptr);
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PUTDOMAIN(rr->Data.MINFO.pNameErrorsMailbox, ptr);
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break;
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case DNS_TYPE_MX:
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case DNS_TYPE_AFSDB:
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case DNS_TYPE_RT:
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if (ptr + 2 > EndPtr)
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ptr += 2;
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else
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PUTSHORT(rr->Data.MX.wPreference, ptr);
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PUTDOMAIN(rr->Data.MX.pNameExchange, ptr);
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break;
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case DNS_TYPE_HINFO:
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case DNS_TYPE_ISDN:
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case DNS_TYPE_TEXT:
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case DNS_TYPE_X25:
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{
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unsigned int i, len;
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for (i = 0; i < rr->Data.TXT.dwStringCount; i++) {
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len = strlen(rr->Data.TXT.pStringArray[i]) & 0xFF;
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if (ptr + len + 1 > EndPtr)
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ptr += len + 1;
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else {
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*ptr++ = len;
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memcpy(ptr, rr->Data.TXT.pStringArray[i], len);
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ptr += len;
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}
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}
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break;
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}
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case DNS_TYPE_SRV:
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if (ptr + 6 > EndPtr)
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ptr += 6;
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else {
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PUTSHORT(rr->Data.SRV.wPriority, ptr);
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PUTSHORT(rr->Data.SRV.wWeight, ptr);
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PUTSHORT(rr->Data.SRV.wPort, ptr);
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}
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PUTDOMAIN(rr->Data.SRV.pNameTarget, ptr);
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break;
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default:
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{
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unsigned int len = rr->wDataLength;
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DPRINTF(debug, "No structure for wType %d\n", rr->wType);
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if (ptr + len <= EndPtr)
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memcpy(ptr, (char *) &rr->Data, len);
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ptr += len;
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break;
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}
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}
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if (rd_length_ptr + 2 <= EndPtr)
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PUTSHORT(ptr - rd_length_ptr - 2, rd_length_ptr);
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return ptr;
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}
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/***********************************************************************
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*
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cygwin_query: implements res_nquery by calling DnsQuery
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***********************************************************************/
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static int cygwin_query(res_state statp, const char * DomName, int Class, int Type,
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unsigned char * AnsPtr, int AnsLength)
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{
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DNS_STATUS res;
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PDNS_RECORD pQueryResultsSet, rr;
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int section, len, counts[4] = {0, 0, 0, 0}, debug = statp->options & RES_DEBUG;
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unsigned char * dnptrs[256], * ptr;
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dnptrs[0] = AnsPtr;
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dnptrs[1] = NULL;
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if (Class != ns_c_in) {
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errno = ENOSYS;
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statp->res_h_errno = NETDB_INTERNAL;
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return -1;
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}
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res = DnsQuery_A(DomName, Type, DNS_QUERY_TREAT_AS_FQDN,
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NULL, &pQueryResultsSet, NULL);
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#if 0
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#define NETDB_INTERNAL -1 /* see errno */
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#define HOST_NOT_FOUND 1 /* Authoritative Answer Host not found */
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#define TRY_AGAIN 2 /* Non-Authoritive Host not found, or SERVERFAIL */
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#define NO_RECOVERY 3 /* Non recoverable errors, FORMERR, REFUSED, NOTIMP */
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#define NO_DATA 4 /* Valid name, no data record of requested type */
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#endif
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DPRINTF(debug, "DnsQuery: %lu (Windows)\n", res);
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if (res) {
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switch (res) {
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case ERROR_INVALID_NAME:
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errno = EINVAL;
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statp->res_h_errno = NETDB_INTERNAL;;
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break;
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case ERROR_TIMEOUT:
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statp->res_h_errno = TRY_AGAIN;
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break;
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case DNS_ERROR_RCODE_NAME_ERROR:
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statp->res_h_errno = HOST_NOT_FOUND;
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break;
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case DNS_ERROR_RCODE_SERVER_FAILURE:
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statp->res_h_errno = TRY_AGAIN;
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break;
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case DNS_ERROR_NO_DNS_SERVERS:
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case DNS_ERROR_RCODE_FORMAT_ERROR:
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case DNS_ERROR_RCODE_NOT_IMPLEMENTED:
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case DNS_ERROR_RCODE_REFUSED:
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statp->res_h_errno = NO_RECOVERY;
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break;
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case DNS_INFO_NO_RECORDS: /* May be returned even if the host doesn't exist */
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statp->res_h_errno = NO_DATA;
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break;
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default:
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DPRINTF(debug, "Unknown code %lu for %s %d\n", res, DomName, Type);
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statp->res_h_errno = NO_RECOVERY;
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break;
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}
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len = -1;
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goto done;
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}
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ptr = AnsPtr + HFIXEDSZ; /* Skip header */
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rr = pQueryResultsSet;
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section = 0;
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while (rr) {
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if (!counts[0] && (rr->Flags.DW & 0x3)) {
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/* No question. Adopt the first name as the name in the question */
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if ((len = dn_comp(rr->pName, ptr, AnsLength - 4,
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dnptrs, &dnptrs[DIM(dnptrs) - 1])) < 0) {
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ptr = NULL;
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break;
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}
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ptr += len;
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PUTSHORT(Type, ptr);
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PUTSHORT(ns_c_in, ptr);
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counts[0] = 1;
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}
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DPRINTF(debug, "%s Section %d Type %u Windows Record Length %u\n",
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rr->pName, rr->Flags.DW & 0x3, rr->wType, rr->wDataLength);
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/* Check the records are in correct section order */
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if ((rr->Flags.DW & 0x3) < section) {
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DPRINTF(debug, "Unexpected section order %s %d\n", DomName, Type);
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continue;
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}
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section = rr->Flags.DW & 0x3;
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ptr = write_record(ptr, rr, AnsPtr + AnsLength, dnptrs,
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&dnptrs[DIM(dnptrs) - 1], debug);
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counts[section]++;
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rr = rr->pNext;
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}
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DnsRecordListFree(pQueryResultsSet, DnsFreeRecordList);
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len = ptr - AnsPtr;
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done:
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ptr = AnsPtr;
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PUTSHORT(0, ptr); /* Id */
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PUTSHORT((QR << 8) + RA + RD, ptr);
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for (section = 0; section < DIM(counts); section++) {
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PUTSHORT(counts[section], ptr);
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}
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return len;
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}
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/***********************************************************************
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*
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get_registry_items: returns dns items from the registry
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in: Unicode representation of registry value "value".
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what: 0 addresses ; 1 search list
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***********************************************************************/
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static void get_registry_dns_items(PUNICODE_STRING in, res_state statp,
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int what)
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{
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int debug = statp->options & RES_DEBUG;
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if (in->Length) {
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char list[in->Length];
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size_t size = wcstombs (list, in->Buffer, in->Length);
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if (what == 0) { /* Get the addresses */
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char *ap, *srch;
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int numAddresses = 0;
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for (ap = list; ap < list + size && *ap; ap = srch) {
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/* The separation character can be 0, ' ', or ','. */
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for (srch = ap; *srch && (isdigit((unsigned) *srch) || *srch == '.' );
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srch++);
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*srch++ = 0;
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if (numAddresses < DIM(statp->nsaddr_list)) {
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DPRINTF(debug, "server \"%s\"\n", ap);
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statp->nsaddr_list[numAddresses].sin_addr.s_addr = cygwin_inet_addr((char *) ap);
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if ( statp->nsaddr_list[numAddresses].sin_addr.s_addr != 0 )
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numAddresses++;
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}
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else
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DPRINTF(debug, "no space for server \"%s\"\n", ap);
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}
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statp->nscount = numAddresses;
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}
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else /* Parse the search line */
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minires_get_search(list, statp);
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}
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return;
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}
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/***********************************************************************
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*
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get_registry_dns:
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Read the registry to get dns server addresses in Network Byte Order,
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and set statp->nscount (for NT <= 4.0)
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Read the registry SearchList
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***********************************************************************/
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static void get_registry_dns(res_state statp)
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{
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NTSTATUS status;
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const PCWSTR keyName = L"Tcpip\\Parameters";
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DPRINTF(statp->options & RES_DEBUG, "key %s\n", keyName);
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status = RtlCheckRegistryKey (RTL_REGISTRY_SERVICES, keyName);
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if (!NT_SUCCESS (status))
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{
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DPRINTF (statp->options & RES_DEBUG, "RtlCheckRegistryKey: status %p\n",
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status);
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return;
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}
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UNICODE_STRING uns = { 0, 0, NULL };
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UNICODE_STRING udns = { 0, 0, NULL };
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UNICODE_STRING usl = { 0, 0, NULL };
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RTL_QUERY_REGISTRY_TABLE tab[4] = {
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{ NULL, RTL_QUERY_REGISTRY_DIRECT | RTL_QUERY_REGISTRY_NOEXPAND,
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L"NameServer", &uns, REG_NONE, NULL, 0 },
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{ NULL, RTL_QUERY_REGISTRY_DIRECT | RTL_QUERY_REGISTRY_NOEXPAND,
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L"DhcpNameServer", &udns, REG_NONE, NULL, 0 },
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{ NULL, RTL_QUERY_REGISTRY_DIRECT | RTL_QUERY_REGISTRY_NOEXPAND,
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L"SearchList", &usl, REG_NONE, NULL, 0 },
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};
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status = RtlQueryRegistryValues (RTL_REGISTRY_SERVICES, keyName, tab,
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NULL, NULL);
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if (!NT_SUCCESS (status))
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{
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DPRINTF (statp->options & RES_DEBUG,
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"RtlQueryRegistryValues: status %p\n", status);
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return;
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}
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if (statp->nscount == 0)
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get_registry_dns_items(&uns, statp, 0);
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if (statp->nscount == 0)
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get_registry_dns_items(&udns, statp, 0);
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if (statp->dnsrch[0] == NULL)
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get_registry_dns_items(&usl, statp, 1);
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if (uns.Buffer)
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RtlFreeUnicodeString (&uns);
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if (udns.Buffer)
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RtlFreeUnicodeString (&udns);
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if (usl.Buffer)
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RtlFreeUnicodeString (&usl);
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return;
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}
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/***********************************************************************
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*
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get_dns_info: Get the search list or the domain name
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and the dns server addresses in Network Byte Order
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Set statp->os_query if DnsQuery is available.
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***********************************************************************/
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void get_dns_info(res_state statp)
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{
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#if MAX_HOSTNAME_LEN > MAXHOSTNAMELEN
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#define MAX_HOSTNAME_SIZE (MAX_HOSTNAME_LEN + 1)
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#else
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#define MAX_HOSTNAME_SIZE (MAXHOSTNAMELEN + 1)
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#endif
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#if MAX_HOSTNAME_SIZE > 256 /* sizeof(defdname) */
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#error stap->defdname too short
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#endif
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int res, debug = statp->options & RES_DEBUG;
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ULONG ulOutBufLen = 0;
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DWORD dwRetVal;
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IP_ADDR_STRING * pIPAddr;
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FIXED_INFO * pFixedInfo;
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int numAddresses = 0;
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if (statp->use_os)
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{
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DPRINTF(debug, "using dnsapi.dll\n");
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statp->os_query = (typeof(statp->os_query)) cygwin_query;
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/* We just need the search list. Avoid loading iphlpapi. */
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statp->nscount = -1;
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}
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if (statp->nscount != 0)
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goto use_registry;
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/* First call to get the buffer length we need */
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dwRetVal = GetNetworkParams((FIXED_INFO *) 0, &ulOutBufLen);
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if (dwRetVal != ERROR_BUFFER_OVERFLOW) {
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DPRINTF(debug, "GetNetworkParams: error %lu (Windows)\n", dwRetVal);
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goto use_registry;
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}
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if ((pFixedInfo = (FIXED_INFO *) alloca(ulOutBufLen)) == 0) {
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DPRINTF(debug, "alloca: %s\n", strerror(errno));
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goto use_registry;
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}
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if ((dwRetVal = GetNetworkParams(pFixedInfo, & ulOutBufLen))) {
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DPRINTF(debug, "GetNetworkParams: error %lu (Windows)\n", dwRetVal);
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goto use_registry;
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}
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DPRINTF(debug, "GetNetworkParams: OK\n");
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/* Record server addresses, up to array size */
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for (pIPAddr = &(pFixedInfo->DnsServerList), numAddresses = 0;
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pIPAddr;
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pIPAddr = pIPAddr->Next) {
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if (numAddresses < DIM(statp->nsaddr_list)) {
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DPRINTF(debug, "server \"%s\"\n", pIPAddr->IpAddress.String);
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statp->nsaddr_list[numAddresses].sin_addr.s_addr = cygwin_inet_addr(pIPAddr->IpAddress.String);
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if (statp->nsaddr_list[numAddresses].sin_addr.s_addr != 0) {
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numAddresses++;
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statp->nscount++;
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}
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}
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else
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DPRINTF(debug, "no space for server \"%s\"\n", pIPAddr->IpAddress.String);
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}
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use_registry:
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get_registry_dns(statp);
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if (!statp->dnsrch[0]) {
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statp->defdname[sizeof(statp->defdname) - 1] = 0;
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if (!(res = getdomainname(statp->defdname, sizeof(statp->defdname)))) {
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if (statp->defdname[0] && !statp->defdname[sizeof(statp->defdname) - 1])
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statp->dnsrch[0] = statp->defdname;
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}
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DPRINTF(debug, "getdomainname \"%s\"\n",
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(res)? strerror(errno) : statp->defdname);
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}
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}
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#else
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/***********************************************************************
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*
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Default interface code
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***********************************************************************/
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void get_dns_info(res_state statp)
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{
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return;
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}
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#endif
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#if 0
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#define DNS_ERROR_RCODE_FORMAT_ERROR 9001L
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#define DNS_ERROR_RCODE_SERVER_FAILURE 9002L
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#define DNS_ERROR_RCODE_NAME_ERROR 9003L
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#define DNS_ERROR_RCODE_NOT_IMPLEMENTED 9004L
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#define DNS_ERROR_RCODE_REFUSED 9005L
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#define DNS_ERROR_RCODE_YXDOMAIN 9006L
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#define DNS_ERROR_RCODE_YXRRSET 9007L
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#define DNS_ERROR_RCODE_NXRRSET 9008L
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#define DNS_ERROR_RCODE_NOTAUTH 9009L
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#define DNS_ERROR_RCODE_NOTZONE 9010L
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#define DNS_ERROR_RCODE_BADSIG 9016L
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#define DNS_ERROR_RCODE_BADKEY 9017L
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#define DNS_ERROR_RCODE_BADTIME 9018L
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#define DNS_INFO_NO_RECORDS 9501L
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#define DNS_ERROR_BAD_PACKET 9502L
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#define DNS_ERROR_NO_PACKET 9503L
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#define DNS_ERROR_RCODE 9504L
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#define DNS_ERROR_UNSECURE_PACKET 9505L
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#define DNS_ERROR_INVALID_TYPE 9551L
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#define DNS_ERROR_INVALID_IP_ADDRESS 9552L
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#define DNS_ERROR_INVALID_PROPERTY 9553L
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#define DNS_ERROR_TRY_AGAIN_LATER 9554L
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#define DNS_ERROR_NOT_UNIQUE 9555L
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#define DNS_ERROR_NON_RFC_NAME 9556L
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#define DNS_STATUS_FQDN 9557L
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#define DNS_STATUS_DOTTED_NAME 9558L
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#define DNS_STATUS_SINGLE_PART_NAME 9559L
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#define DNS_ERROR_INVALID_NAME_CHAR 9560L
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#define DNS_ERROR_NUMERIC_NAME 9561L
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#define DNS_ERROR_NOT_LALOWED_ON_ROOT_SERVER 9562L
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#define DNS_ERROR_NOT_ALLOWED_UNDER_DELEGATION 9563L
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#define DNS_ERROR_CANNOT_FIND_ROOT_HINTS 9564L
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#define DNS_ERROR_INCONSISTENT_ROOT_HINTS 9565L
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#define DNS_ERROR_ZONE_DOES_NOT_EXIST 9601L
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#define DNS_ERROR_NO_ZONE_INFO 9602L
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#define DNS_ERROR_INVALID_ZONE_OPERATION 9603L
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#define DNS_ERROR_ZONE_CONFIGURATION_ERROR 9604L
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#define DNS_ERROR_ZONE_HAS_NO_SOA_RECORD 9605L
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#define DNS_ERROR_ZONE_HAS_NO_NS_RECORDS 9606L
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#define DNS_ERROR_ZONE_LOCKED 9607L
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#define DNS_ERROR_ZONE_CREATION_FAILED 9608L
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#define DNS_ERROR_ZONE_ALREADY_EXISTS 9609L
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#define DNS_ERROR_AUTOZONE_ALREADY_EXISTS 9610L
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#define DNS_ERROR_INVALID_ZONE_TYPE 9611L
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#define DNS_ERROR_SECONDARY_REQUIRES_MASTER_IP 9612L
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#define DNS_ERROR_ZONE_NOT_SECONDARY 9613L
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#define DNS_ERROR_NEED_SECONDARY_ADDRESSES 9614L
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#define DNS_ERROR_WINS_INIT_FAILED 9615L
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#define DNS_ERROR_NEED_WINS_SERVERS 9616L
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#define DNS_ERROR_NBSTAT_INIT_FAILED 9617L
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#define DNS_ERROR_SOA_DELETE_INVALID 9618L
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#define DNS_ERROR_FORWARDER_ALREADY_EXISTS 9619L
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#define DNS_ERROR_ZONE_REQUIRES_MASTER_IP 9620L
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#define DNS_ERROR_ZONE_IS_SHUTDOWN 9621L
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#define DNS_ERROR_PRIMARY_REQUIRES_DATAFILE 9651L
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#define DNS_ERROR_INVALID_DATAFILE_NAME 9652L
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#define DNS_ERROR_DATAFILE_OPEN_FAILURE 9653L
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#define DNS_ERROR_FILE_WRITEBACK_FAILED 9654L
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#define DNS_ERROR_DATAFILE_PARSING 9655L
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#define DNS_ERROR_RECORD_DOES_NOT_EXIST 9701L
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#define DNS_ERROR_RECORD_FORMAT 9702L
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#define DNS_ERROR_NODE_CREATION_FAILED 9703L
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#define DNS_ERROR_UNKNOWN_RECORD_TYPE 9704L
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#define DNS_ERROR_RECORD_TIMED_OUT 9705L
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#define DNS_ERROR_NAME_NOT_IN_ZONE 9706L
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#define DNS_ERROR_CNAME_LOOP 9707L
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#define DNS_ERROR_NODE_IS_CNAME 9708L
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#define DNS_ERROR_CNAME_COLLISION 9709L
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#define DNS_ERROR_RECORD_ONLY_AT_ZONE_ROOT 9710L
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#define DNS_ERROR_RECORD_ALREADY_EXISTS 9711L
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#define DNS_ERROR_SECONDARY_DATA 9712L
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#define DNS_ERROR_NO_CREATE_CACHE_DATA 9713L
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#define DNS_ERROR_NAME_DOES_NOT_EXIST 9714L
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#define DNS_WARNING_PTR_CREATE_FAILED 9715L
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#define DNS_WARNING_DOMAIN_UNDELETED 9716L
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#define DNS_ERROR_DS_UNAVAILABLE 9717L
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#define DNS_ERROR_DS_ZONE_ALREADY_EXISTS 9718L
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#define DNS_ERROR_NO_BOOTFILE_IF_DS_ZONE 9719L
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#define DNS_INFO_AXFR_COMPLETE 9751L
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#define DNS_ERROR_AXFR 9752L
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#define DNS_INFO_ADDED_LOCAL_WINS 9753L
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#define DNS_STATUS_CONTINUE_NEEDED 9801L
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#define DNS_ERROR_NO_TCPIP 9851L
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#define DNS_ERROR_NO_DNS_SERVERS 9852L
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#define DNS_ERROR_DP_DOES_NOT_EXIST 9901L
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#define DNS_ERROR_DP_ALREADY_EXISTS 9902L
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#define DNS_ERROR_DP_NOT_ENLISTED 9903L
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#define DNS_ERROR_DP_ALREADY_ENLISTED 9904L
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#define DNS_ERROR_DP_NOT_AVAILABLE 9905L
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#endif
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