/*
 * Copyright (c) 1999 - 2001 Kungliga Tekniska Högskolan
 * (Royal Institute of Technology, Stockholm, Sweden).
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * 3. Neither the name of the Institute nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <config.h>

#include "roken.h"

static int
doit (int af,
      const void *addr,
      size_t addrlen,
      int port,
      char *host, size_t hostlen,
      char *serv, size_t servlen,
      int flags)
{
    if (host != NULL) {
        if (flags & NI_NUMERICHOST) {
            if (inet_ntop (af, addr, host, hostlen) == NULL)
                return EAI_SYSTEM;
        } else {
            struct hostent *he = gethostbyaddr (addr,
                                                addrlen,
                                                af);
            if (he != NULL) {
                strlcpy (host, hostent_find_fqdn(he), hostlen);
                if (flags & NI_NOFQDN) {
                    char *dot = strchr (host, '.');
                    if (dot != NULL)
                        *dot = '\0';
                }
            } else if (flags & NI_NAMEREQD) {
                return EAI_NONAME;
            } else if (inet_ntop (af, addr, host, hostlen) == NULL)
                return EAI_SYSTEM;
        }
    }

    if (serv != NULL) {
        if (flags & NI_NUMERICSERV) {
            snprintf (serv, servlen, "%u", ntohs(port));
        } else {
            const char *proto = "tcp";
            struct servent *se;

            if (flags & NI_DGRAM)
                proto = "udp";

            se = getservbyport (port, proto);
            if (se == NULL) {
                snprintf (serv, servlen, "%u", ntohs(port));
            } else {
                strlcpy (serv, se->s_name, servlen);
            }
        }
    }
    return 0;
}

/*
 *
 */

ROKEN_LIB_FUNCTION int ROKEN_LIB_CALL
getnameinfo(const struct sockaddr *sa, socklen_t salen,
            char *host, size_t hostlen,
            char *serv, size_t servlen,
            int flags)
{
    switch (sa->sa_family) {
#ifdef HAVE_IPV6
    case AF_INET6 : {
        const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)sa;

        return doit (AF_INET6, &sin6->sin6_addr, sizeof(sin6->sin6_addr),
                     sin6->sin6_port,
                     host, hostlen,
                     serv, servlen,
                     flags);
    }
#endif
    case AF_INET : {
        const struct sockaddr_in *sin4 = (const struct sockaddr_in *)sa;

        return doit (AF_INET, &sin4->sin_addr, sizeof(sin4->sin_addr),
                     sin4->sin_port,
                     host, hostlen,
                     serv, servlen,
                     flags);
    }
    default :
        return EAI_FAMILY;
    }
}