| 1 | /*-
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| 2 | * Copyright (c) 1985, 1988, 1993
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| 3 | * The Regents of the University of California. All rights reserved.
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| 4 | *
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| 5 | * Portions copyright (c) 1999, 2000
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| 6 | * Intel Corporation.
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| 7 | * All rights reserved.
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| 8 | *
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| 9 | * Redistribution and use in source and binary forms, with or without
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| 10 | * modification, are permitted provided that the following conditions
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| 11 | * are met:
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| 12 | *
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| 13 | * 1. Redistributions of source code must retain the above copyright
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| 14 | * notice, this list of conditions and the following disclaimer.
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| 15 | *
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| 16 | * 2. Redistributions in binary form must reproduce the above copyright
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| 17 | * notice, this list of conditions and the following disclaimer in the
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| 18 | * documentation and/or other materials provided with the distribution.
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| 19 | *
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| 20 | * 3. All advertising materials mentioning features or use of this software
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| 21 | * must display the following acknowledgement:
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| 22 | *
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| 23 | * This product includes software developed by the University of
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| 24 | * California, Berkeley, Intel Corporation, and its contributors.
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| 25 | *
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| 26 | * 4. Neither the name of University, Intel Corporation, or their respective
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| 27 | * contributors may be used to endorse or promote products derived from
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| 28 | * this software without specific prior written permission.
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| 29 | *
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| 30 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS, INTEL CORPORATION AND
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| 31 | * CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING,
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| 32 | * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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| 33 | * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS,
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| 34 | * INTEL CORPORATION OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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| 35 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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| 36 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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| 37 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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| 38 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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| 39 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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| 40 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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| 41 | * -
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| 42 | * Portions Copyright (c) 1993 by Digital Equipment Corporation.
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| 43 | *
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| 44 | * Permission to use, copy, modify, and distribute this software for any
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| 45 | * purpose with or without fee is hereby granted, provided that the above
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| 46 | * copyright notice and this permission notice appear in all copies, and that
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| 47 | * the name of Digital Equipment Corporation not be used in advertising or
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| 48 | * publicity pertaining to distribution of the document or software without
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| 49 | * specific, written prior permission.
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| 50 | *
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| 51 | * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
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| 52 | * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
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| 53 | * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT
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| 54 | * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
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| 55 | * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
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| 56 | * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
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| 57 | * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
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| 58 | * SOFTWARE.
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| 59 | * -
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| 60 | * --Copyright--
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| 61 | */
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| 62 | /* Portions Copyright (c) 1993 Carlos Leandro and Rui Salgueiro
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| 63 | * Dep. Matematica Universidade de Coimbra, Portugal, Europe
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| 64 | *
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| 65 | * Permission to use, copy, modify, and distribute this software for any
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| 66 | * purpose with or without fee is hereby granted, provided that the above
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| 67 | * copyright notice and this permission notice appear in all copies.
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| 68 | */
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| 69 |
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| 70 | #if defined(LIBC_SCCS) && !defined(lint)
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| 71 | static char sccsid[] = "@(#)gethostnamadr.c 8.1 (Berkeley) 6/4/93";
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| 72 | static char rcsid[] = "$Id: getnetbydns.c,v 1.1.1.1 2003/11/19 01:51:27 kyu3 Exp $";
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| 73 | #endif /* LIBC_SCCS and not lint */
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| 74 |
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| 75 | #include <sys/param.h>
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| 76 | #include <sys/socket.h>
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| 77 | #include <netinet/in.h>
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| 78 | #include <arpa/inet.h>
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| 79 | #include <arpa/nameser.h>
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| 80 |
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| 81 | #include <stdio.h>
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| 82 | #include <netdb.h>
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| 83 | #include <resolv.h>
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| 84 | #include <ctype.h>
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| 85 | #include <errno.h>
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| 86 | #include <string.h>
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| 87 | #include <unistd.h>
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| 88 | #ifdef _ORG_FREEBSD_
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| 89 | #include <syslog.h>
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| 90 | #endif
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| 91 |
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| 92 | #include "res_config.h"
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| 93 | #include "Socklib_internals.h"
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| 94 |
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| 95 | extern int h_errno;
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| 96 |
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| 97 | #define BYADDR 0
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| 98 | #define BYNAME 1
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| 99 | #define MAXALIASES 35
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| 100 |
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| 101 | #if PACKETSZ > 1024
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| 102 | #define MAXPACKET PACKETSZ
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| 103 | #else
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| 104 | #define MAXPACKET 1024
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| 105 | #endif
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| 106 |
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| 107 | typedef union {
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| 108 | HEADER hdr;
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| 109 | u_char buf[MAXPACKET];
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| 110 | } querybuf;
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| 111 |
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| 112 | typedef union {
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| 113 | long al;
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| 114 | char ac;
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| 115 | } align;
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| 116 |
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| 117 | static struct netent *
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| 118 | getnetanswer(querybuf *answer, int anslen, int net_i)
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| 119 | {
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| 120 |
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| 121 | register HEADER *hp;
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| 122 | register u_char *cp;
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| 123 | register int n;
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| 124 | u_char *eom;
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| 125 | int type, class, buflen, ancount, qdcount, haveanswer, i, nchar;
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| 126 | char aux1[MAXHOSTNAMELEN], aux2[MAXHOSTNAMELEN], ans[MAXHOSTNAMELEN];
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| 127 | char *in, *st, *pauxt, *bp, **ap;
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| 128 | char *paux1 = &aux1[0], *paux2 = &aux2[0], flag = 0;
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| 129 | static struct netent net_entry;
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| 130 | static char *net_aliases[MAXALIASES], netbuf[PACKETSZ];
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| 131 |
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| 132 | /*
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| 133 | * find first satisfactory answer
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| 134 | *
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| 135 | * answer --> +------------+ ( MESSAGE )
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| 136 | * | Header |
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| 137 | * +------------+
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| 138 | * | Question | the question for the name server
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| 139 | * +------------+
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| 140 | * | Answer | RRs answering the question
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| 141 | * +------------+
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| 142 | * | Authority | RRs pointing toward an authority
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| 143 | * | Additional | RRs holding additional information
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| 144 | * +------------+
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| 145 | */
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| 146 | eom = answer->buf + anslen;
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| 147 | hp = &answer->hdr;
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| 148 | ancount = ntohs(hp->ancount); /* #/records in the answer section */
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| 149 | qdcount = ntohs(hp->qdcount); /* #/entries in the question section */
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| 150 | bp = netbuf;
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| 151 | buflen = sizeof(netbuf);
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| 152 | cp = answer->buf + HFIXEDSZ;
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| 153 | if (!qdcount) {
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| 154 | if (hp->aa)
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| 155 | h_errno = HOST_NOT_FOUND;
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| 156 | else
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| 157 | h_errno = TRY_AGAIN;
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| 158 | return (NULL);
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| 159 | }
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| 160 | while (qdcount-- > 0)
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| 161 | cp += __dn_skipname(cp, eom) + QFIXEDSZ;
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| 162 | ap = net_aliases;
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| 163 | *ap = NULL;
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| 164 | net_entry.n_aliases = net_aliases;
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| 165 | haveanswer = 0;
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| 166 | while (--ancount >= 0 && cp < eom) {
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| 167 | n = dn_expand(answer->buf, eom, cp, bp, buflen);
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| 168 | if ((n < 0) || !res_dnok(bp))
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| 169 | break;
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| 170 | cp += n;
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| 171 | ans[0] = '\0';
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| 172 | (void)strncpy(&ans[0], bp, sizeof(ans) - 1);
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| 173 | ans[sizeof(ans) - 1] = '\0';
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| 174 | GETSHORT(type, cp);
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| 175 | GETSHORT(class, cp);
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| 176 | cp += INT32SZ; /* TTL */
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| 177 | GETSHORT(n, cp);
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| 178 | if (class == C_IN && type == T_PTR) {
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| 179 | n = dn_expand(answer->buf, eom, cp, bp, buflen);
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| 180 | if ((n < 0) || !res_hnok(bp)) {
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| 181 | cp += n;
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| 182 | return (NULL);
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| 183 | }
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| 184 | cp += n;
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| 185 | *ap++ = bp;
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| 186 | bp += strlen(bp) + 1;
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| 187 | net_entry.n_addrtype =
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| 188 | (class == C_IN) ? AF_INET : AF_UNSPEC;
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| 189 | haveanswer++;
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| 190 | }
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| 191 | }
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| 192 | if (haveanswer) {
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| 193 | *ap = NULL;
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| 194 | switch (net_i) {
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| 195 | case BYADDR:
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| 196 | net_entry.n_name = *net_entry.n_aliases;
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| 197 | net_entry.n_net = 0L;
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| 198 | break;
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| 199 | case BYNAME:
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| 200 | in = *net_entry.n_aliases;
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| 201 | net_entry.n_name = &ans[0];
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| 202 | aux2[0] = '\0';
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| 203 | for (i = 0; i < 4; i++) {
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| 204 | for (st = in, nchar = 0;
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| 205 | *st != '.';
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| 206 | st++, nchar++)
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| 207 | ;
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| 208 | if (nchar != 1 || *in != '0' || flag) {
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| 209 | flag = 1;
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| 210 | (void)strncpy(paux1,
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| 211 | (i==0) ? in : in-1,
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| 212 | (i==0) ?nchar : nchar+1);
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| 213 | paux1[(i==0) ? nchar : nchar+1] = '\0';
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| 214 | pauxt = paux2;
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| 215 | paux2 = strcat(paux1, paux2);
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| 216 | paux1 = pauxt;
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| 217 | }
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| 218 | in = ++st;
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| 219 | }
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| 220 | net_entry.n_net = inet_network(paux2);
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| 221 | break;
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| 222 | }
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| 223 | net_entry.n_aliases++;
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| 224 | return (&net_entry);
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| 225 | }
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| 226 | h_errno = TRY_AGAIN;
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| 227 | return (NULL);
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| 228 | }
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| 229 |
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| 230 | struct netent *
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| 231 | _getnetbydnsaddr(register unsigned long net, register int net_type)
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| 232 | {
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| 233 | unsigned int netbr[4];
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| 234 | int nn, anslen;
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| 235 | querybuf buf;
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| 236 | char qbuf[MAXDNAME];
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| 237 | unsigned long net2;
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| 238 | struct netent *net_entry;
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| 239 |
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| 240 | if (net_type != AF_INET)
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| 241 | return (NULL);
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| 242 |
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| 243 | for (nn = 4, net2 = net; net2; net2 >>= 8)
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| 244 | netbr[--nn] = net2 & 0xff;
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| 245 | switch (nn) {
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| 246 | case 3: /* Class A */
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| 247 | sprintf(qbuf, "0.0.0.%u.in-addr.arpa", netbr[3]);
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| 248 | break;
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| 249 | case 2: /* Class B */
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| 250 | sprintf(qbuf, "0.0.%u.%u.in-addr.arpa", netbr[3], netbr[2]);
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| 251 | break;
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| 252 | case 1: /* Class C */
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| 253 | sprintf(qbuf, "0.%u.%u.%u.in-addr.arpa", netbr[3], netbr[2],
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| 254 | netbr[1]);
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| 255 | break;
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| 256 | case 0: /* Class D - E */
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| 257 | sprintf(qbuf, "%u.%u.%u.%u.in-addr.arpa", netbr[3], netbr[2],
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| 258 | netbr[1], netbr[0]);
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| 259 | break;
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| 260 | }
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| 261 | anslen = res_query(qbuf, C_IN, T_PTR, (u_char *)&buf, sizeof(buf));
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| 262 | if (anslen < 0) {
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| 263 | #ifdef DEBUG
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| 264 | if (_res.options & RES_DEBUG)
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| 265 | printf("res_query failed\n");
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| 266 | #endif
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| 267 | return (NULL);
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| 268 | }
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| 269 | net_entry = getnetanswer(&buf, anslen, BYADDR);
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| 270 | if (net_entry) {
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| 271 | unsigned u_net = net; /* maybe net should be unsigned ? */
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| 272 |
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| 273 | /* Strip trailing zeros */
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| 274 | while ((u_net & 0xff) == 0 && u_net != 0)
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| 275 | u_net >>= 8;
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| 276 | net_entry->n_net = u_net;
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| 277 | return (net_entry);
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| 278 | }
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| 279 | return (NULL);
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| 280 | }
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| 281 |
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| 282 | struct netent *
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| 283 | _getnetbydnsname(register const char *net)
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| 284 | {
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| 285 | int anslen;
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| 286 | querybuf buf;
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| 287 | char qbuf[MAXDNAME];
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| 288 |
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| 289 | if ((_res.options & RES_INIT) == 0 && res_init() == -1) {
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| 290 | h_errno = NETDB_INTERNAL;
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| 291 | return (NULL);
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| 292 | }
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| 293 | strncpy(qbuf, net, sizeof(qbuf) - 1);
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| 294 | qbuf[sizeof(qbuf) - 1] = '\0';
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| 295 | anslen = res_search(qbuf, C_IN, T_PTR, (u_char *)&buf, sizeof(buf));
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| 296 | if (anslen < 0) {
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| 297 | #ifdef DEBUG
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| 298 | if (_res.options & RES_DEBUG)
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| 299 | printf("res_query failed\n");
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| 300 | #endif
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| 301 | return (NULL);
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| 302 | }
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| 303 | return getnetanswer(&buf, anslen, BYNAME);
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| 304 | }
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| 305 |
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| 306 | void
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| 307 | _setnetdnsent(int stayopen)
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| 308 | {
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| 309 | if (stayopen)
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| 310 | _res.options |= RES_STAYOPEN | RES_USEVC;
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| 311 | }
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| 312 |
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| 313 | void
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| 314 | _endnetdnsent()
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| 315 | {
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| 316 | _res.options &= ~(RES_STAYOPEN | RES_USEVC);
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| 317 | res_close();
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| 318 | }
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