res_gethost.c (d67944fb) res_gethost.c (bd0e95e6)
1/*
1/*
2 * Copyright 2015 Gary Mills
2 * Copyright 2009 Sun Microsystems, Inc. All rights reserved.
3 * Use is subject to license terms.
4 */
5
6/*
7 * Copyright (c) 1985, 1988 Regents of the University of California.
8 * All rights reserved.
9 *

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18
19#include <sys/param.h>
20#include <sys/socket.h>
21#include <netinet/in.h>
22#include <ctype.h>
23#include <netdb.h>
24#include <stdio.h>
25#include <errno.h>
3 * Copyright 2009 Sun Microsystems, Inc. All rights reserved.
4 * Use is subject to license terms.
5 */
6
7/*
8 * Copyright (c) 1985, 1988 Regents of the University of California.
9 * All rights reserved.
10 *

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19
20#include <sys/param.h>
21#include <sys/socket.h>
22#include <netinet/in.h>
23#include <ctype.h>
24#include <netdb.h>
25#include <stdio.h>
26#include <errno.h>
27#include <string.h>
26#include <arpa/inet.h>
27#include <arpa/nameser.h>
28#include <resolv.h>
29#include <syslog.h>
28#include <arpa/inet.h>
29#include <arpa/nameser.h>
30#include <resolv.h>
31#include <syslog.h>
32#include "crossl.h"
30
31/*
32 * When the name service switch calls libresolv, it doesn't want fallback
33 * to /etc/hosts, so we provide a method to turn it off.
34 */
35static int no_hosts_fallback = 0;
36
37void

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98 hp = &answer->hdr;
99 ancount = ntohs(hp->ancount);
100 qdcount = ntohs(hp->qdcount);
101 bp = hostbuf;
102 buflen = sizeof (hostbuf);
103 cp = answer->buf + sizeof (HEADER);
104 if (qdcount) {
105 if (iquery) {
33
34/*
35 * When the name service switch calls libresolv, it doesn't want fallback
36 * to /etc/hosts, so we provide a method to turn it off.
37 */
38static int no_hosts_fallback = 0;
39
40void

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101 hp = &answer->hdr;
102 ancount = ntohs(hp->ancount);
103 qdcount = ntohs(hp->qdcount);
104 bp = hostbuf;
105 buflen = sizeof (hostbuf);
106 cp = answer->buf + sizeof (HEADER);
107 if (qdcount) {
108 if (iquery) {
106 if ((n = dn_expand((char *)answer->buf, eom,
107 cp, bp, buflen)) < 0) {
109 if ((n = dn_expand(answer->buf, eom,
110 cp, (u_char *)bp, buflen)) < 0) {
108 h_errno = NO_RECOVERY;
109 return ((struct hostent *) NULL);
110 }
111 cp += n + QFIXEDSZ;
112 host.h_name = bp;
113 n = strlen(bp) + 1;
114 bp += n;
115 buflen -= n;

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127 ap = host_aliases;
128 host.h_aliases = host_aliases;
129 hap = h_addr_ptrs;
130#if BSD >= 43 || defined(h_addr) /* new-style hostent structure */
131 host.h_addr_list = h_addr_ptrs;
132#endif
133 haveanswer = 0;
134 while (--ancount >= 0 && cp < eom && haveanswer < MAXADDRS) {
111 h_errno = NO_RECOVERY;
112 return ((struct hostent *) NULL);
113 }
114 cp += n + QFIXEDSZ;
115 host.h_name = bp;
116 n = strlen(bp) + 1;
117 bp += n;
118 buflen -= n;

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130 ap = host_aliases;
131 host.h_aliases = host_aliases;
132 hap = h_addr_ptrs;
133#if BSD >= 43 || defined(h_addr) /* new-style hostent structure */
134 host.h_addr_list = h_addr_ptrs;
135#endif
136 haveanswer = 0;
137 while (--ancount >= 0 && cp < eom && haveanswer < MAXADDRS) {
135 if ((n = dn_expand((char *)answer->buf, eom,
136 cp, bp, buflen)) < 0)
138 if ((n = dn_expand(answer->buf, eom,
139 cp, (u_char *)bp, buflen)) < 0)
137 break;
138 cp += n;
139 type = _getshort(cp);
140 cp += sizeof (u_short);
141 class = _getshort(cp);
142 cp += sizeof (u_short) + sizeof (u_long);
143 n = _getshort(cp);
144 cp += sizeof (u_short);
145 if (type == T_CNAME) {
146 cp += n;
147 if (ap >= &host_aliases[MAXALIASES-1])
148 continue;
149 *ap++ = bp;
150 n = strlen(bp) + 1;
151 bp += n;
152 buflen -= n;
153 continue;
154 }
155 if (iquery && type == T_PTR) {
140 break;
141 cp += n;
142 type = _getshort(cp);
143 cp += sizeof (u_short);
144 class = _getshort(cp);
145 cp += sizeof (u_short) + sizeof (u_long);
146 n = _getshort(cp);
147 cp += sizeof (u_short);
148 if (type == T_CNAME) {
149 cp += n;
150 if (ap >= &host_aliases[MAXALIASES-1])
151 continue;
152 *ap++ = bp;
153 n = strlen(bp) + 1;
154 bp += n;
155 buflen -= n;
156 continue;
157 }
158 if (iquery && type == T_PTR) {
156 if ((n = dn_expand((char *)answer->buf, eom,
157 cp, bp, buflen)) < 0) {
159 if ((n = dn_expand(answer->buf, eom,
160 cp, (u_char *)bp, buflen)) < 0) {
158 cp += n;
159 continue;
160 }
161 cp += n;
162 host.h_name = bp;
163 return (&host);
164 }
165 if (iquery || type != T_A) {

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226
227struct hostent *
228res_gethostbyname(name)
229 char *name;
230{
231 querybuf buf;
232 register char *cp;
233 int n;
161 cp += n;
162 continue;
163 }
164 cp += n;
165 host.h_name = bp;
166 return (&host);
167 }
168 if (iquery || type != T_A) {

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229
230struct hostent *
231res_gethostbyname(name)
232 char *name;
233{
234 querybuf buf;
235 register char *cp;
236 int n;
234 struct hostent *hp, *gethostdomain();
235
236 /*
237 * disallow names consisting only of digits/dots, unless
238 * they end in a dot.
239 */
240 if (isdigit(name[0]))
241 for (cp = name; /*EMPTY*/; ++cp) {
242 if (!*cp) {

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276
277 if (type != AF_INET)
278 return ((struct hostent *) NULL);
279 (void) sprintf(qbuf, "%d.%d.%d.%d.in-addr.arpa",
280 ((unsigned)addr[3] & 0xff),
281 ((unsigned)addr[2] & 0xff),
282 ((unsigned)addr[1] & 0xff),
283 ((unsigned)addr[0] & 0xff));
237
238 /*
239 * disallow names consisting only of digits/dots, unless
240 * they end in a dot.
241 */
242 if (isdigit(name[0]))
243 for (cp = name; /*EMPTY*/; ++cp) {
244 if (!*cp) {

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278
279 if (type != AF_INET)
280 return ((struct hostent *) NULL);
281 (void) sprintf(qbuf, "%d.%d.%d.%d.in-addr.arpa",
282 ((unsigned)addr[3] & 0xff),
283 ((unsigned)addr[2] & 0xff),
284 ((unsigned)addr[1] & 0xff),
285 ((unsigned)addr[0] & 0xff));
284 n = res_query(qbuf, C_IN, T_PTR, (char *)&buf, sizeof (buf));
286 n = res_query(qbuf, C_IN, T_PTR, (u_char *)&buf, sizeof (buf));
285 if (n < 0) {
286#ifdef DEBUG
287 if (_res.options & RES_DEBUG)
288 printf("res_query failed\n");
289#endif
290 if (errno == ECONNREFUSED)
291 return (_gethtbyaddr(addr, len, type));
292 return ((struct hostent *) NULL);

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288#ifdef DEBUG
289 if (_res.options & RES_DEBUG)
290 printf("res_query failed\n");
291#endif
292 if (errno == ECONNREFUSED)
293 return (_gethtbyaddr(addr, len, type));
294 return ((struct hostent *) NULL);

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