11fceb383Ssemery /*
21fceb383Ssemery * CDDL HEADER START
31fceb383Ssemery *
41fceb383Ssemery * The contents of this file are subject to the terms of the
51fceb383Ssemery * Common Development and Distribution License (the "License").
61fceb383Ssemery * You may not use this file except in compliance with the License.
71fceb383Ssemery *
81fceb383Ssemery * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
91fceb383Ssemery * or http://www.opensolaris.org/os/licensing.
101fceb383Ssemery * See the License for the specific language governing permissions
111fceb383Ssemery * and limitations under the License.
121fceb383Ssemery *
131fceb383Ssemery * When distributing Covered Code, include this CDDL HEADER in each
141fceb383Ssemery * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
151fceb383Ssemery * If applicable, add the following below this CDDL HEADER, with the
161fceb383Ssemery * fields enclosed by brackets "[]" replaced with your own identifying
171fceb383Ssemery * information: Portions Copyright [yyyy] [name of copyright owner]
181fceb383Ssemery *
191fceb383Ssemery * CDDL HEADER END
201fceb383Ssemery */
211fceb383Ssemery
221fceb383Ssemery /*
23bd211b85Ssemery * Copyright 2008 Sun Microsystems, Inc. All rights reserved.
241fceb383Ssemery * Use is subject to license terms.
251fceb383Ssemery */
269c62f9ecSMarcel Telka /*
279c62f9ecSMarcel Telka * Copyright 2014 Nexenta Systems, Inc. All rights reserved.
289c62f9ecSMarcel Telka */
291fceb383Ssemery
301fceb383Ssemery #include <sys/types.h>
311fceb383Ssemery #include <netinet/in.h>
321fceb383Ssemery #include <arpa/nameser.h>
331fceb383Ssemery #include <resolv.h>
341fceb383Ssemery #include <netdb.h>
351fceb383Ssemery #include <limits.h>
361fceb383Ssemery #include <stdlib.h>
371fceb383Ssemery #include <string.h>
381fceb383Ssemery #include <unistd.h>
391fceb383Ssemery #include <ctype.h>
401fceb383Ssemery
41bd211b85Ssemery /*
42bd211b85Ssemery * Private resolver of target and type with arguments:
43bd211b85Ssemery * klooukp [ target [ RR_type ] ]
44bd211b85Ssemery *
45bd211b85Ssemery * Utitilizes DNS lookups to discover domain and realm information. This CLI
46*bbf21555SRichard Lowe * is used primarily by kdcmgr(8) and kclient(8).
47bd211b85Ssemery */
48bd211b85Ssemery
491fceb383Ssemery int
501fceb383Ssemery /* ARGSUSED */
main(int argc,char ** argv)511fceb383Ssemery main(int argc, char **argv)
521fceb383Ssemery {
53bd211b85Ssemery unsigned char answer[NS_MAXMSG], *ansp = NULL, *end, a, b, c, d;
541fceb383Ssemery int len = 0, anslen, hostlen, nq, na, type, class;
552f8bbd9dSToomas Soome int ttl __unused, priority __unused, weight __unused, port, size;
56bd211b85Ssemery char name[NS_MAXDNAME], *cp, *typestr = NULL;
57bd211b85Ssemery char nbuf[INET6_ADDRSTRLEN];
581fceb383Ssemery struct __res_state stat;
591fceb383Ssemery int found = 0;
60bd211b85Ssemery int rr_type = T_A;
611fceb383Ssemery HEADER *h;
621fceb383Ssemery
63ff67a31bSToomas Soome type = T_A;
64ff67a31bSToomas Soome
65bd211b85Ssemery if (argc > 3)
661fceb383Ssemery exit(1);
671fceb383Ssemery
68bd211b85Ssemery if (argc == 1) {
69bd211b85Ssemery if (gethostname(name, MAXHOSTNAMELEN) != 0)
701fceb383Ssemery exit(1);
71bd211b85Ssemery } else {
72bd211b85Ssemery (void) strncpy(name, (char *)argv[1], NS_MAXDNAME);
73bd211b85Ssemery if (argc == 3) {
74bd211b85Ssemery typestr = argv[2];
75bd211b85Ssemery
76bd211b85Ssemery switch (*typestr) {
77bd211b85Ssemery case 'A':
78bd211b85Ssemery rr_type = T_A;
79bd211b85Ssemery break;
80bd211b85Ssemery case 'C':
81bd211b85Ssemery rr_type = T_CNAME;
82bd211b85Ssemery break;
83bd211b85Ssemery case 'I':
84bd211b85Ssemery rr_type = T_A;
85bd211b85Ssemery break;
86bd211b85Ssemery case 'P':
87bd211b85Ssemery rr_type = T_PTR;
889c62f9ecSMarcel Telka (void) sscanf(name, "%hhd.%hhd.%hhd.%hhd",
89bd211b85Ssemery &a, &b, &c, &d);
90bd211b85Ssemery (void) sprintf(name, "%d.%d.%d.%d.in-addr.arpa",
91bd211b85Ssemery d, c, b, a);
92bd211b85Ssemery break;
93bd211b85Ssemery case 'S':
94bd211b85Ssemery rr_type = T_SRV;
95bd211b85Ssemery break;
96bd211b85Ssemery default:
97bd211b85Ssemery exit(1);
98bd211b85Ssemery }
99bd211b85Ssemery }
100bd211b85Ssemery }
1011fceb383Ssemery
1021fceb383Ssemery (void) memset(&stat, 0, sizeof (stat));
1031fceb383Ssemery
1041fceb383Ssemery if (res_ninit(&stat) == -1)
1051fceb383Ssemery exit(1);
1061fceb383Ssemery
1071fceb383Ssemery anslen = sizeof (answer);
108bd211b85Ssemery len = res_nsearch(&stat, name, C_IN, rr_type, answer, anslen);
1091fceb383Ssemery
110bd211b85Ssemery if (len < sizeof (HEADER)) {
111bd211b85Ssemery res_ndestroy(&stat);
1121fceb383Ssemery exit(1);
113bd211b85Ssemery }
1141fceb383Ssemery
1151fceb383Ssemery ansp = answer;
1161fceb383Ssemery end = ansp + anslen;
1171fceb383Ssemery
1181fceb383Ssemery /* LINTED */
1191fceb383Ssemery h = (HEADER *)answer;
1201fceb383Ssemery nq = ntohs(h->qdcount);
1211fceb383Ssemery na = ntohs(h->ancount);
1221fceb383Ssemery ansp += HFIXEDSZ;
1231fceb383Ssemery
124bd211b85Ssemery if (nq != 1 || na < 1) {
125bd211b85Ssemery res_ndestroy(&stat);
1261fceb383Ssemery exit(1);
127bd211b85Ssemery }
1281fceb383Ssemery
129bd211b85Ssemery hostlen = sizeof (name);
130bd211b85Ssemery len = dn_expand(answer, end, ansp, name, hostlen);
131bd211b85Ssemery if (len < 0) {
132bd211b85Ssemery res_ndestroy(&stat);
1331fceb383Ssemery exit(1);
134bd211b85Ssemery }
1351fceb383Ssemery
1361fceb383Ssemery ansp += len + QFIXEDSZ;
1371fceb383Ssemery
138bd211b85Ssemery if (ansp > end) {
139bd211b85Ssemery res_ndestroy(&stat);
1401fceb383Ssemery exit(1);
141bd211b85Ssemery }
1421fceb383Ssemery
1431fceb383Ssemery while (na-- > 0 && ansp < end) {
144bd211b85Ssemery
145bd211b85Ssemery len = dn_expand(answer, end, ansp, name, hostlen);
1461fceb383Ssemery
1471fceb383Ssemery if (len < 0)
1481fceb383Ssemery continue;
149bd211b85Ssemery ansp += len; /* name */
150bd211b85Ssemery NS_GET16(type, ansp); /* type */
151bd211b85Ssemery NS_GET16(class, ansp); /* class */
152bd211b85Ssemery NS_GET32(ttl, ansp); /* ttl */
153bd211b85Ssemery NS_GET16(size, ansp); /* size */
154bd211b85Ssemery
155bd211b85Ssemery if ((ansp + size) > end) {
156bd211b85Ssemery res_ndestroy(&stat);
157bd211b85Ssemery exit(1);
158bd211b85Ssemery }
159bd211b85Ssemery if (type == T_SRV) {
160bd211b85Ssemery NS_GET16(priority, ansp);
161bd211b85Ssemery NS_GET16(weight, ansp);
162bd211b85Ssemery NS_GET16(port, ansp);
163bd211b85Ssemery len = dn_expand(answer, end, ansp, name, hostlen);
164bd211b85Ssemery if (len < 0) {
165bd211b85Ssemery res_ndestroy(&stat);
166bd211b85Ssemery exit(1);
167bd211b85Ssemery }
168bd211b85Ssemery for (cp = name; *cp; cp++) {
169bd211b85Ssemery *cp = tolower(*cp);
170bd211b85Ssemery }
171bd211b85Ssemery (void) printf("%s %d\n", name, port);
172bd211b85Ssemery } else if (typestr && *typestr == 'I') {
173bd211b85Ssemery (void) inet_ntop(AF_INET, (void *)ansp, nbuf,
174bd211b85Ssemery INET6_ADDRSTRLEN);
175ae5b046dSsemery len = size;
176ae5b046dSsemery (void) printf("%s\n", nbuf);
177bd211b85Ssemery } else if (type == T_PTR) {
178bd211b85Ssemery len = dn_expand(answer, end, ansp, name, hostlen);
179bd211b85Ssemery if (len < 0) {
180bd211b85Ssemery res_ndestroy(&stat);
181bd211b85Ssemery exit(1);
182bd211b85Ssemery }
183bd211b85Ssemery }
1841fceb383Ssemery ansp += len;
185bd211b85Ssemery if (type == rr_type && class == C_IN) {
1861fceb383Ssemery found = 1;
187ae5b046dSsemery if (type != T_SRV && !(typestr && *typestr == 'I'))
1881fceb383Ssemery break;
1891fceb383Ssemery }
1901fceb383Ssemery }
1911fceb383Ssemery
192bd211b85Ssemery if (found != 1) {
193bd211b85Ssemery res_ndestroy(&stat);
1941fceb383Ssemery exit(1);
195bd211b85Ssemery }
1961fceb383Ssemery
197bd211b85Ssemery for (cp = name; *cp; cp++) {
1981fceb383Ssemery *cp = tolower(*cp);
1991fceb383Ssemery }
2001fceb383Ssemery
201ae5b046dSsemery if (type != T_SRV && !(typestr && *typestr == 'I'))
202bd211b85Ssemery (void) printf("%s\n", name);
203bd211b85Ssemery
204bd211b85Ssemery res_ndestroy(&stat);
2051fceb383Ssemery
2061fceb383Ssemery return (0);
2071fceb383Ssemery }
208