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authorMatt A. Tobin <email@mattatobin.com>2019-11-03 00:17:46 -0400
committerMatt A. Tobin <email@mattatobin.com>2019-11-03 00:17:46 -0400
commit302bf1b523012e11b60425d6eee1221ebc2724eb (patch)
treeb191a895f8716efcbe42f454f37597a545a6f421 /ldap/c-sdk/libraries/libldap/getdxbyname.c
parent21b3f6247403c06f85e1f45d219f87549862198f (diff)
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Issue #1258 - Part 1: Import mailnews, ldap, and mork from comm-esr52.9.1
Diffstat (limited to 'ldap/c-sdk/libraries/libldap/getdxbyname.c')
-rw-r--r--ldap/c-sdk/libraries/libldap/getdxbyname.c279
1 files changed, 279 insertions, 0 deletions
diff --git a/ldap/c-sdk/libraries/libldap/getdxbyname.c b/ldap/c-sdk/libraries/libldap/getdxbyname.c
new file mode 100644
index 000000000..d70614458
--- /dev/null
+++ b/ldap/c-sdk/libraries/libldap/getdxbyname.c
@@ -0,0 +1,279 @@
+/* ***** BEGIN LICENSE BLOCK *****
+ * Version: MPL 1.1/GPL 2.0/LGPL 2.1
+ *
+ * The contents of this file are subject to the Mozilla Public License Version
+ * 1.1 (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.mozilla.org/MPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the
+ * License.
+ *
+ * The Original Code is Mozilla Communicator client code, released
+ * March 31, 1998.
+ *
+ * The Initial Developer of the Original Code is
+ * Netscape Communications Corporation.
+ * Portions created by the Initial Developer are Copyright (C) 1998-1999
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s):
+ *
+ * Alternatively, the contents of this file may be used under the terms of
+ * either of the GNU General Public License Version 2 or later (the "GPL"),
+ * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
+ * in which case the provisions of the GPL or the LGPL are applicable instead
+ * of those above. If you wish to allow use of your version of this file only
+ * under the terms of either the GPL or the LGPL, and not to allow others to
+ * use your version of this file under the terms of the MPL, indicate your
+ * decision by deleting the provisions above and replace them with the notice
+ * and other provisions required by the GPL or the LGPL. If you do not delete
+ * the provisions above, a recipient may use your version of this file under
+ * the terms of any one of the MPL, the GPL or the LGPL.
+ *
+ * ***** END LICENSE BLOCK ***** */
+/*
+ * Copyright (c) 1995 Regents of the University of Michigan.
+ * All rights reserved.
+ */
+/*
+ * nsldapi_getdxbyname - retrieve DX records from the DNS (from
+ * TXT records for now)
+ */
+
+#include <stdio.h>
+
+#ifdef LDAP_DNS
+
+XXX not MT-safe XXX
+
+#include <string.h>
+#include <ctype.h>
+
+#ifdef macintosh
+#include <stdlib.h>
+#include "macos.h"
+#endif /* macintosh */
+
+#ifdef _WINDOWS
+#include <windows.h>
+#endif
+
+#if !defined(macintosh) && !defined(DOS) && !defined( _WINDOWS )
+#include <sys/types.h>
+#include <netinet/in.h>
+#include <arpa/nameser.h>
+#include <sys/time.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netdb.h>
+#include <resolv.h>
+#endif
+#include "ldap-int.h"
+
+#if defined( DOS )
+#include "msdos.h"
+#endif /* DOS */
+
+
+#ifdef NEEDPROTOS
+static char ** decode_answer( unsigned char *answer, int len );
+#else /* NEEDPROTOS */
+static char **decode_answer();
+#endif /* NEEDPROTOS */
+
+extern int h_errno;
+extern char *h_errlist[];
+
+
+#define MAX_TO_SORT 32
+
+
+/*
+ * nsldapi_getdxbyname - lookup DNS DX records for domain and return an ordered
+ * array.
+ */
+char **
+nsldapi_getdxbyname( char *domain )
+{
+ unsigned char buf[ PACKETSZ ];
+ char **dxs;
+ int rc;
+
+ LDAPDebug( LDAP_DEBUG_TRACE, "nsldapi_getdxbyname( %s )\n", domain, 0, 0 );
+
+ memset( buf, 0, sizeof( buf ));
+
+ /* XXX not MT safe XXX */
+ if (( rc = res_search( domain, C_IN, T_TXT, buf, sizeof( buf ))) < 0
+ || ( rc > sizeof( buf ))
+ || ( dxs = decode_answer( buf, rc )) == NULL ) {
+ /*
+ * punt: return list consisting of the original domain name only
+ */
+ if (( dxs = (char **)NSLDAPI_MALLOC( 2 * sizeof( char * ))) == NULL ||
+ ( dxs[ 0 ] = nsldapi_strdup( domain )) == NULL ) {
+ if ( dxs != NULL ) {
+ NSLDAPI_FREE( dxs );
+ }
+ dxs = NULL;
+ } else {
+ dxs[ 1 ] = NULL;
+ }
+ }
+
+ return( dxs );
+}
+
+
+static char **
+decode_answer( unsigned char *answer, int len )
+{
+ HEADER *hp;
+ char buf[ 256 ], **dxs;
+ unsigned char *eom, *p;
+ int ancount, err, rc, type, class, dx_count, rr_len;
+ int dx_pref[ MAX_TO_SORT ];
+
+#ifdef LDAP_DEBUG
+ if ( ldap_debug & LDAP_DEBUG_PACKETS ) {
+/* __p_query( answer ); */
+ }
+#endif /* LDAP_DEBUG */
+
+ dxs = NULL;
+ hp = (HEADER *)answer;
+ eom = answer + len;
+
+ if ( len < sizeof( *hp ) ) {
+ h_errno = NO_RECOVERY;
+ return( NULL );
+ }
+
+ if ( ntohs( hp->qdcount ) != 1 ) {
+ h_errno = NO_RECOVERY;
+ return( NULL );
+ }
+
+ ancount = ntohs( hp->ancount );
+ if ( ancount < 1 ) {
+ h_errno = NO_DATA;
+ return( NULL );
+ }
+
+ /*
+ * skip over the query
+ */
+ p = answer + HFIXEDSZ;
+ if (( rc = dn_expand( answer, eom, p, buf, sizeof( buf ))) < 0 ) {
+ h_errno = NO_RECOVERY;
+ return( NULL );
+ }
+ p += ( rc + QFIXEDSZ );
+
+ /*
+ * pull out the answers we are interested in
+ */
+ err = dx_count = 0;
+ while ( ancount > 0 && err == 0 && p < eom ) {
+ if (( rc = dn_expand( answer, eom, p, buf, sizeof( buf ))) < 0 ) {
+ err = NO_RECOVERY;
+ continue;
+ }
+ p += rc; /* skip over name */
+ if ( p + 3 * INT16SZ + INT32SZ > eom ) {
+ err = NO_RECOVERY;
+ continue;
+ }
+ type = _getshort( p );
+ p += INT16SZ;
+ class = _getshort( p );
+ p += INT16SZ;
+ p += INT32SZ; /* skip over TTL */
+ rr_len = _getshort( p );
+ p += INT16SZ;
+ if ( p + rr_len > eom ) {
+ err = NO_RECOVERY;
+ continue;
+ }
+ if ( class == C_IN && type == T_TXT ) {
+ int i, n, pref, txt_len;
+ char *q, *r;
+
+ q = (char *)p;
+ while ( q < (char *)p + rr_len && err == 0 ) {
+ if ( *q >= 3 && strncasecmp( q + 1, "dx:", 3 ) == 0 ) {
+ txt_len = *q - 3;
+ r = q + 4;
+ while ( isspace( *r )) {
+ ++r;
+ --txt_len;
+ }
+ pref = 0;
+ while ( isdigit( *r )) {
+ pref *= 10;
+ pref += ( *r - '0' );
+ ++r;
+ --txt_len;
+ }
+ if ( dx_count < MAX_TO_SORT - 1 ) {
+ dx_pref[ dx_count ] = pref;
+ }
+ while ( isspace( *r )) {
+ ++r;
+ --txt_len;
+ }
+ if ( dx_count == 0 ) {
+ dxs = (char **)NSLDAPI_MALLOC( 2 * sizeof( char * ));
+ } else {
+ dxs = (char **)NSLDAPI_REALLOC( dxs,
+ ( dx_count + 2 ) * sizeof( char * ));
+ }
+ if ( dxs == NULL || ( dxs[ dx_count ] =
+ (char *)NSLDAPI_CALLOC( 1, txt_len + 1 ))
+ == NULL ) {
+ err = NO_RECOVERY;
+ continue;
+ }
+ SAFEMEMCPY( dxs[ dx_count ], r, txt_len );
+ dxs[ ++dx_count ] = NULL;
+ }
+ q += ( *q + 1 ); /* move past last TXT record */
+ }
+ }
+ p += rr_len;
+ }
+
+ if ( err == 0 ) {
+ if ( dx_count == 0 ) {
+ err = NO_DATA;
+ } else {
+ /*
+ * sort records based on associated preference value
+ */
+ int i, j, sort_count, tmp_pref;
+ char *tmp_dx;
+
+ sort_count = ( dx_count < MAX_TO_SORT ) ? dx_count : MAX_TO_SORT;
+ for ( i = 0; i < sort_count; ++i ) {
+ for ( j = i + 1; j < sort_count; ++j ) {
+ if ( dx_pref[ i ] > dx_pref[ j ] ) {
+ tmp_pref = dx_pref[ i ];
+ dx_pref[ i ] = dx_pref[ j ];
+ dx_pref[ j ] = tmp_pref;
+ tmp_dx = dxs[ i ];
+ dxs[ i ] = dxs[ j ];
+ dxs[ j ] = tmp_dx;
+ }
+ }
+ }
+ }
+ }
+
+ h_errno = err;
+ return( dxs );
+}
+
+#endif /* LDAP_DNS */