155682Smarkm/* 2103423Snectar * Copyright (c) 1999 - 2002 Kungliga Tekniska H�gskolan 355682Smarkm * (Royal Institute of Technology, Stockholm, Sweden). 455682Smarkm * All rights reserved. 555682Smarkm * 655682Smarkm * Redistribution and use in source and binary forms, with or without 755682Smarkm * modification, are permitted provided that the following conditions 855682Smarkm * are met: 955682Smarkm * 1055682Smarkm * 1. Redistributions of source code must retain the above copyright 1155682Smarkm * notice, this list of conditions and the following disclaimer. 1255682Smarkm * 1355682Smarkm * 2. Redistributions in binary form must reproduce the above copyright 1455682Smarkm * notice, this list of conditions and the following disclaimer in the 1555682Smarkm * documentation and/or other materials provided with the distribution. 1655682Smarkm * 1755682Smarkm * 3. Neither the name of the Institute nor the names of its contributors 1855682Smarkm * may be used to endorse or promote products derived from this software 1955682Smarkm * without specific prior written permission. 2055682Smarkm * 2155682Smarkm * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND 2255682Smarkm * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 2355682Smarkm * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 2455682Smarkm * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE 2555682Smarkm * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 2655682Smarkm * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 2755682Smarkm * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 2855682Smarkm * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 2955682Smarkm * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 3055682Smarkm * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 3155682Smarkm * SUCH DAMAGE. 3255682Smarkm */ 3355682Smarkm 3455682Smarkm#ifdef HAVE_CONFIG_H 3555682Smarkm#include <config.h> 36178825SdfrRCSID("$Id: getnameinfo_verified.c 14773 2005-04-12 11:29:18Z lha $"); 3755682Smarkm#endif 3855682Smarkm 3955682Smarkm#include "roken.h" 4055682Smarkm 41103423Snectar/* 42103423Snectar * Try to obtain a verified name for the address in `sa, salen' (much 43103423Snectar * similar to getnameinfo). 44103423Snectar * Verified in this context means that forwards and backwards lookups 45103423Snectar * in DNS are consistent. If that fails, return an error if the 46103423Snectar * NI_NAMEREQD flag is set or return the numeric address as a string. 47103423Snectar */ 48103423Snectar 49178825Sdfrint ROKEN_LIB_FUNCTION 5055682Smarkmgetnameinfo_verified(const struct sockaddr *sa, socklen_t salen, 5155682Smarkm char *host, size_t hostlen, 5255682Smarkm char *serv, size_t servlen, 5355682Smarkm int flags) 5455682Smarkm{ 5555682Smarkm int ret; 5655682Smarkm struct addrinfo *ai, *a; 5778527Sassar char servbuf[NI_MAXSERV]; 5878527Sassar struct addrinfo hints; 5955682Smarkm 6055682Smarkm if (host == NULL) 6155682Smarkm return EAI_NONAME; 6255682Smarkm 6378527Sassar if (serv == NULL) { 6478527Sassar serv = servbuf; 6578527Sassar servlen = sizeof(servbuf); 6678527Sassar } 6778527Sassar 6878527Sassar ret = getnameinfo (sa, salen, host, hostlen, serv, servlen, 6978527Sassar flags | NI_NUMERICSERV); 7055682Smarkm if (ret) 71103423Snectar goto fail; 7278527Sassar 7378527Sassar memset (&hints, 0, sizeof(hints)); 7478527Sassar hints.ai_socktype = SOCK_STREAM; 7578527Sassar ret = getaddrinfo (host, serv, &hints, &ai); 7655682Smarkm if (ret) 77103423Snectar goto fail; 7855682Smarkm for (a = ai; a != NULL; a = a->ai_next) { 7955682Smarkm if (a->ai_addrlen == salen 8072445Sassar && memcmp (a->ai_addr, sa, salen) == 0) { 8172445Sassar freeaddrinfo (ai); 8255682Smarkm return 0; 8372445Sassar } 8455682Smarkm } 8572445Sassar freeaddrinfo (ai); 86103423Snectar fail: 8755682Smarkm if (flags & NI_NAMEREQD) 8855682Smarkm return EAI_NONAME; 8955682Smarkm ret = getnameinfo (sa, salen, host, hostlen, serv, servlen, 9055682Smarkm flags | NI_NUMERICSERV | NI_NUMERICHOST); 9155682Smarkm return ret; 9255682Smarkm} 93