1*ebfedea0SLionel Sambuc /* $NetBSD: getnameinfo_verified.c,v 1.1.1.1 2011/04/13 18:15:41 elric Exp $ */
2*ebfedea0SLionel Sambuc
3*ebfedea0SLionel Sambuc /*
4*ebfedea0SLionel Sambuc * Copyright (c) 1999 - 2002 Kungliga Tekniska Högskolan
5*ebfedea0SLionel Sambuc * (Royal Institute of Technology, Stockholm, Sweden).
6*ebfedea0SLionel Sambuc * All rights reserved.
7*ebfedea0SLionel Sambuc *
8*ebfedea0SLionel Sambuc * Redistribution and use in source and binary forms, with or without
9*ebfedea0SLionel Sambuc * modification, are permitted provided that the following conditions
10*ebfedea0SLionel Sambuc * are met:
11*ebfedea0SLionel Sambuc *
12*ebfedea0SLionel Sambuc * 1. Redistributions of source code must retain the above copyright
13*ebfedea0SLionel Sambuc * notice, this list of conditions and the following disclaimer.
14*ebfedea0SLionel Sambuc *
15*ebfedea0SLionel Sambuc * 2. Redistributions in binary form must reproduce the above copyright
16*ebfedea0SLionel Sambuc * notice, this list of conditions and the following disclaimer in the
17*ebfedea0SLionel Sambuc * documentation and/or other materials provided with the distribution.
18*ebfedea0SLionel Sambuc *
19*ebfedea0SLionel Sambuc * 3. Neither the name of the Institute nor the names of its contributors
20*ebfedea0SLionel Sambuc * may be used to endorse or promote products derived from this software
21*ebfedea0SLionel Sambuc * without specific prior written permission.
22*ebfedea0SLionel Sambuc *
23*ebfedea0SLionel Sambuc * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
24*ebfedea0SLionel Sambuc * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25*ebfedea0SLionel Sambuc * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26*ebfedea0SLionel Sambuc * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
27*ebfedea0SLionel Sambuc * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28*ebfedea0SLionel Sambuc * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29*ebfedea0SLionel Sambuc * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30*ebfedea0SLionel Sambuc * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31*ebfedea0SLionel Sambuc * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32*ebfedea0SLionel Sambuc * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33*ebfedea0SLionel Sambuc * SUCH DAMAGE.
34*ebfedea0SLionel Sambuc */
35*ebfedea0SLionel Sambuc
36*ebfedea0SLionel Sambuc #include <config.h>
37*ebfedea0SLionel Sambuc
38*ebfedea0SLionel Sambuc #include <krb5/roken.h>
39*ebfedea0SLionel Sambuc
40*ebfedea0SLionel Sambuc /*
41*ebfedea0SLionel Sambuc * Try to obtain a verified name for the address in `sa, salen' (much
42*ebfedea0SLionel Sambuc * similar to getnameinfo).
43*ebfedea0SLionel Sambuc * Verified in this context means that forwards and backwards lookups
44*ebfedea0SLionel Sambuc * in DNS are consistent. If that fails, return an error if the
45*ebfedea0SLionel Sambuc * NI_NAMEREQD flag is set or return the numeric address as a string.
46*ebfedea0SLionel Sambuc */
47*ebfedea0SLionel Sambuc
48*ebfedea0SLionel Sambuc ROKEN_LIB_FUNCTION int ROKEN_LIB_CALL
getnameinfo_verified(const struct sockaddr * sa,socklen_t salen,char * host,size_t hostlen,char * serv,size_t servlen,int flags)49*ebfedea0SLionel Sambuc getnameinfo_verified(const struct sockaddr *sa, socklen_t salen,
50*ebfedea0SLionel Sambuc char *host, size_t hostlen,
51*ebfedea0SLionel Sambuc char *serv, size_t servlen,
52*ebfedea0SLionel Sambuc int flags)
53*ebfedea0SLionel Sambuc {
54*ebfedea0SLionel Sambuc int ret;
55*ebfedea0SLionel Sambuc struct addrinfo *ai, *a;
56*ebfedea0SLionel Sambuc char servbuf[NI_MAXSERV];
57*ebfedea0SLionel Sambuc struct addrinfo hints;
58*ebfedea0SLionel Sambuc void *saaddr;
59*ebfedea0SLionel Sambuc size_t sasize;
60*ebfedea0SLionel Sambuc
61*ebfedea0SLionel Sambuc if (host == NULL)
62*ebfedea0SLionel Sambuc return EAI_NONAME;
63*ebfedea0SLionel Sambuc
64*ebfedea0SLionel Sambuc if (serv == NULL) {
65*ebfedea0SLionel Sambuc serv = servbuf;
66*ebfedea0SLionel Sambuc servlen = sizeof(servbuf);
67*ebfedea0SLionel Sambuc }
68*ebfedea0SLionel Sambuc
69*ebfedea0SLionel Sambuc ret = getnameinfo (sa, salen, host, hostlen, serv, servlen,
70*ebfedea0SLionel Sambuc flags | NI_NUMERICSERV);
71*ebfedea0SLionel Sambuc if (ret)
72*ebfedea0SLionel Sambuc goto fail;
73*ebfedea0SLionel Sambuc
74*ebfedea0SLionel Sambuc memset (&hints, 0, sizeof(hints));
75*ebfedea0SLionel Sambuc hints.ai_socktype = SOCK_STREAM;
76*ebfedea0SLionel Sambuc ret = getaddrinfo (host, serv, &hints, &ai);
77*ebfedea0SLionel Sambuc if (ret)
78*ebfedea0SLionel Sambuc goto fail;
79*ebfedea0SLionel Sambuc
80*ebfedea0SLionel Sambuc saaddr = socket_get_address(sa);
81*ebfedea0SLionel Sambuc sasize = socket_addr_size(sa);
82*ebfedea0SLionel Sambuc for (a = ai; a != NULL; a = a->ai_next) {
83*ebfedea0SLionel Sambuc if (sasize == socket_addr_size(a->ai_addr) &&
84*ebfedea0SLionel Sambuc memcmp(saaddr, socket_get_address(a->ai_addr), sasize) == 0) {
85*ebfedea0SLionel Sambuc freeaddrinfo (ai);
86*ebfedea0SLionel Sambuc return 0;
87*ebfedea0SLionel Sambuc }
88*ebfedea0SLionel Sambuc }
89*ebfedea0SLionel Sambuc freeaddrinfo (ai);
90*ebfedea0SLionel Sambuc fail:
91*ebfedea0SLionel Sambuc if (flags & NI_NAMEREQD)
92*ebfedea0SLionel Sambuc return EAI_NONAME;
93*ebfedea0SLionel Sambuc ret = getnameinfo (sa, salen, host, hostlen, serv, servlen,
94*ebfedea0SLionel Sambuc flags | NI_NUMERICSERV | NI_NUMERICHOST);
95*ebfedea0SLionel Sambuc return ret;
96*ebfedea0SLionel Sambuc }
97