383 lines
11 KiB
C
383 lines
11 KiB
C
/* Copyright (C) 1996, 1997, 1998, 1999 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Extended from original form by Ulrich Drepper <drepper@cygnus.com>, 1996.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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/* Parts of this file are plain copies of the file `getnetnamadr.c' from
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the bind package and it has the following copyright. */
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/* Copyright (c) 1993 Carlos Leandro and Rui Salgueiro
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* Dep. Matematica Universidade de Coimbra, Portugal, Europe
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*/
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/*
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* Copyright (c) 1983, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <ctype.h>
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#include <errno.h>
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#include <netdb.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "nsswitch.h"
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#include <arpa/inet.h>
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/* Maximum number of aliases we allow. */
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#define MAX_NR_ALIASES 48
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#if PACKETSZ > 1024
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#define MAXPACKET PACKETSZ
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#else
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#define MAXPACKET 1024
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#endif
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typedef enum
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{
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BYADDR,
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BYNAME
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} lookup_method;
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/* We need this time later. */
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typedef union querybuf
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{
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HEADER hdr;
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u_char buf[MAXPACKET];
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} querybuf;
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/* These functions are defined in res_comp.c. */
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#define NS_MAXCDNAME 255 /* maximum compressed domain name */
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extern int __ns_name_ntop __P ((const u_char *, char *, size_t));
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extern int __ns_name_unpack __P ((const u_char *, const u_char *,
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const u_char *, u_char *, size_t));
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/* Prototypes for local functions. */
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static enum nss_status getanswer_r (const querybuf *answer, int anslen,
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struct netent *result, char *buffer,
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size_t buflen, lookup_method net_i);
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enum nss_status
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_nss_dns_getnetbyname_r (const char *name, struct netent *result,
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char *buffer, size_t buflen, int *errnop)
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{
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/* Return entry for network with NAME. */
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querybuf net_buffer;
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int anslen;
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char *qbuf;
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qbuf = strdupa (name);
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anslen = res_search (qbuf, C_IN, T_PTR, (u_char *) &net_buffer,
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sizeof (querybuf));
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if (anslen < 0)
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{
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/* Nothing found. */
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*errnop = errno;
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return (errno == ECONNREFUSED
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|| errno == EPFNOSUPPORT
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|| errno == EAFNOSUPPORT)
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? NSS_STATUS_UNAVAIL : NSS_STATUS_NOTFOUND;
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}
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return getanswer_r (&net_buffer, anslen, result, buffer, buflen, BYNAME);
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}
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enum nss_status
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_nss_dns_getnetbyaddr_r (long net, int type, struct netent *result,
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char *buffer, size_t buflen, int *errnop)
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{
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/* Return entry for network with NAME. */
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enum nss_status status;
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querybuf net_buffer;
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unsigned int net_bytes[4];
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char qbuf[MAXDNAME];
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int cnt, anslen;
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u_int32_t net2;
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/* No net address lookup for IPv6 yet. */
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if (type != AF_INET)
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return NSS_STATUS_UNAVAIL;
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net2 = (u_int32_t) net;
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for (cnt = 4; net2 != 0; net2 >>= 8)
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net_bytes[--cnt] = net2 & 0xff;
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switch (cnt)
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{
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case 3:
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/* Class A network. */
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sprintf (qbuf, "0.0.0.%u.in-addr.arpa", net_bytes[3]);
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break;
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case 2:
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/* Class B network. */
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sprintf (qbuf, "0.0.%u.%u.in-addr.arpa", net_bytes[3], net_bytes[2]);
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break;
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case 1:
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/* Class C network. */
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sprintf (qbuf, "0.%u.%u.%u.in-addr.arpa", net_bytes[3], net_bytes[2],
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net_bytes[1]);
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break;
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case 0:
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/* Class D - E network. */
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sprintf (qbuf, "%u.%u.%u.%u.in-addr.arpa", net_bytes[3], net_bytes[2],
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net_bytes[1], net_bytes[0]);
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break;
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}
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anslen = res_query (qbuf, C_IN, T_PTR, (u_char *) &net_buffer,
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sizeof (querybuf));
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if (anslen < 0)
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{
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/* Nothing found. */
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*errnop = errno;
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return (errno == ECONNREFUSED
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|| errno == EPFNOSUPPORT
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|| errno == EAFNOSUPPORT)
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? NSS_STATUS_UNAVAIL : NSS_STATUS_NOTFOUND;
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}
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status = getanswer_r (&net_buffer, anslen, result, buffer, buflen, BYADDR);
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if (status == NSS_STATUS_SUCCESS)
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{
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/* Strip trailing zeros. */
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unsigned int u_net = net; /* Maybe net should be unsigned? */
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while ((u_net & 0xff) == 0 && u_net != 0)
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u_net >>= 8;
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result->n_net = u_net;
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}
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return status;
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}
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#undef offsetof
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#define offsetof(Type, Member) ((size_t) &((Type *) NULL)->Member)
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static enum nss_status
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getanswer_r (const querybuf *answer, int anslen, struct netent *result,
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char *buffer, size_t buflen, lookup_method net_i)
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{
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/*
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* Find first satisfactory answer
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*
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* answer --> +------------+ ( MESSAGE )
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* | Header |
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* +------------+
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* | Question | the question for the name server
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* +------------+
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* | Answer | RRs answering the question
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* +------------+
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* | Authority | RRs pointing toward an authority
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* | Additional | RRs holding additional information
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* +------------+
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*/
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struct net_data
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{
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char *aliases[MAX_NR_ALIASES];
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char linebuffer[0];
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} *net_data = (struct net_data *) buffer;
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int linebuflen = buflen - offsetof (struct net_data, linebuffer);
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const char *end_of_message = &answer->buf[anslen];
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const HEADER *header_pointer = &answer->hdr;
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/* #/records in the answer section. */
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int answer_count = ntohs (header_pointer->ancount);
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/* #/entries in the question section. */
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int question_count = ntohs (header_pointer->qdcount);
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char *bp = net_data->linebuffer;
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const char *cp = &answer->buf[HFIXEDSZ];
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char **alias_pointer;
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int have_answer;
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char *ans;
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u_char packtmp[NS_MAXCDNAME];
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if (question_count == 0)
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{
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/* FIXME: the Sun version uses for host name lookup an additional
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parameter for pointing to h_errno. this is missing here.
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OSF/1 has a per-thread h_errno variable. */
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if (header_pointer->aa != 0)
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{
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__set_h_errno (HOST_NOT_FOUND);
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return NSS_STATUS_NOTFOUND;
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}
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else
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{
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__set_h_errno (TRY_AGAIN);
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return NSS_STATUS_TRYAGAIN;
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}
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}
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/* Skip the question part. */
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while (question_count-- > 0)
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cp += __dn_skipname (cp, end_of_message) + QFIXEDSZ;
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alias_pointer = result->n_aliases = &net_data->aliases[0];
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*alias_pointer = NULL;
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have_answer = 0;
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ans = NULL;
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while (--answer_count >= 0 && cp < end_of_message)
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{
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int n = dn_expand (answer->buf, end_of_message, cp, bp, linebuflen);
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int type, class;
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n = __ns_name_unpack (answer->buf, end_of_message, cp,
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packtmp, sizeof packtmp);
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if (n != -1 && __ns_name_ntop (packtmp, bp, linebuflen) == -1)
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{
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if (errno == EMSGSIZE)
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{
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errno = ERANGE;
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return NSS_STATUS_TRYAGAIN;
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}
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n = -1;
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}
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if (n > 0 && bp[0] == '.')
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bp[0] = '\0';
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if (n < 0 || res_dnok (bp) == 0)
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break;
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cp += n;
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ans = strdupa (bp);
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GETSHORT (type, cp);
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GETSHORT (class, cp);
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cp += INT32SZ; /* TTL */
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GETSHORT (n, cp);
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if (class == C_IN && type == T_PTR)
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{
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n = __ns_name_unpack (answer->buf, end_of_message, cp,
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packtmp, sizeof packtmp);
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if (n != -1 && __ns_name_ntop (packtmp, bp, linebuflen) == -1)
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{
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if (errno == EMSGSIZE)
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{
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errno = ERANGE;
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return NSS_STATUS_TRYAGAIN;
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}
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n = -1;
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}
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if (n < 0 || !res_hnok (bp))
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{
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/* XXX What does this mean? The original form from bind
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returns NULL. Incrementing cp has no effect in any case.
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What should I return here. ??? */
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cp += n;
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return NSS_STATUS_UNAVAIL;
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}
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cp += n;
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*alias_pointer++ = bp;
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bp += strlen (bp) + 1;
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result->n_addrtype = class == C_IN ? AF_INET : AF_UNSPEC;
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++have_answer;
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}
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}
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if (have_answer)
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{
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char *tmp;
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int len;
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char *in, *cp, *rp, *wp;
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int cnt, first_flag;
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*alias_pointer = NULL;
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switch (net_i)
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{
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case BYADDR:
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result->n_name = result->n_aliases[0];
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result->n_net = 0L;
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break;
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case BYNAME:
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len = strlen (result->n_aliases[0]);
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tmp = (char *) alloca (len + 1);
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tmp[len] = 0;
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wp = &tmp[len - 1];
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rp = in = result->n_aliases[0];
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result->n_name = ans;
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first_flag = 1;
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for (cnt = 0; cnt < 4; ++cnt)
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{
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char *startp;
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startp = rp;
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while (*rp != '.')
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++rp;
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if (rp - startp > 1 || *startp != '0' || !first_flag)
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{
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first_flag = 0;
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if (cnt > 0)
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*wp-- = '.';
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cp = rp;
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while (cp > startp)
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*wp-- = *--cp;
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}
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in = rp + 1;
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}
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result->n_net = inet_network (wp);
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break;
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}
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++result->n_aliases;
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return NSS_STATUS_SUCCESS;
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}
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__set_h_errno (TRY_AGAIN);
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return NSS_STATUS_TRYAGAIN;
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}
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