/crypto/heimdal/lib/roken/getnameinfo.c

  1/*
  2 * Copyright (c) 1999 - 2001 Kungliga Tekniska Hรถgskolan
  3 * (Royal Institute of Technology, Stockholm, Sweden).
  4 * All rights reserved.
  5 *
  6 * Redistribution and use in source and binary forms, with or without
  7 * modification, are permitted provided that the following conditions
  8 * are met:
  9 *
 10 * 1. Redistributions of source code must retain the above copyright
 11 *    notice, this list of conditions and the following disclaimer.
 12 *
 13 * 2. Redistributions in binary form must reproduce the above copyright
 14 *    notice, this list of conditions and the following disclaimer in the
 15 *    documentation and/or other materials provided with the distribution.
 16 *
 17 * 3. Neither the name of the Institute nor the names of its contributors
 18 *    may be used to endorse or promote products derived from this software
 19 *    without specific prior written permission.
 20 *
 21 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 24 * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 31 * SUCH DAMAGE.
 32 */
 33
 34#include <config.h>
 35
 36#include "roken.h"
 37
 38static int
 39doit (int af,
 40      const void *addr,
 41      size_t addrlen,
 42      int port,
 43      char *host, size_t hostlen,
 44      char *serv, size_t servlen,
 45      int flags)
 46{
 47    if (host != NULL) {
 48	if (flags & NI_NUMERICHOST) {
 49	    if (inet_ntop (af, addr, host, hostlen) == NULL)
 50		return EAI_SYSTEM;
 51	} else {
 52	    struct hostent *he = gethostbyaddr (addr,
 53						addrlen,
 54						af);
 55	    if (he != NULL) {
 56		strlcpy (host, hostent_find_fqdn(he), hostlen);
 57		if (flags & NI_NOFQDN) {
 58		    char *dot = strchr (host, '.');
 59		    if (dot != NULL)
 60			*dot = '\0';
 61		}
 62	    } else if (flags & NI_NAMEREQD) {
 63		return EAI_NONAME;
 64	    } else if (inet_ntop (af, addr, host, hostlen) == NULL)
 65		return EAI_SYSTEM;
 66	}
 67    }
 68
 69    if (serv != NULL) {
 70	if (flags & NI_NUMERICSERV) {
 71	    snprintf (serv, servlen, "%u", ntohs(port));
 72	} else {
 73	    const char *proto = "tcp";
 74	    struct servent *se;
 75
 76	    if (flags & NI_DGRAM)
 77		proto = "udp";
 78
 79	    se = getservbyport (port, proto);
 80	    if (se == NULL) {
 81		snprintf (serv, servlen, "%u", ntohs(port));
 82	    } else {
 83		strlcpy (serv, se->s_name, servlen);
 84	    }
 85	}
 86    }
 87    return 0;
 88}
 89
 90/*
 91 *
 92 */
 93
 94ROKEN_LIB_FUNCTION int ROKEN_LIB_CALL
 95getnameinfo(const struct sockaddr *sa, socklen_t salen,
 96	    char *host, size_t hostlen,
 97	    char *serv, size_t servlen,
 98	    int flags)
 99{
100    switch (sa->sa_family) {
101#ifdef HAVE_IPV6
102    case AF_INET6 : {
103	const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)sa;
104
105	return doit (AF_INET6, &sin6->sin6_addr, sizeof(sin6->sin6_addr),
106		     sin6->sin6_port,
107		     host, hostlen,
108		     serv, servlen,
109		     flags);
110    }
111#endif
112    case AF_INET : {
113	const struct sockaddr_in *sin4 = (const struct sockaddr_in *)sa;
114
115	return doit (AF_INET, &sin4->sin_addr, sizeof(sin4->sin_addr),
116		     sin4->sin_port,
117		     host, hostlen,
118		     serv, servlen,
119		     flags);
120    }
121    default :
122	return EAI_FAMILY;
123    }
124}