/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (the "License").  You may not use this file except in compliance
 * with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */

/*
 * Copyright (c) 2018 Peter Tribble.
 * Copyright (c) 1994-1999, by Sun Microsystems, Inc.
 */

#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <string.h>
#include <netdb.h>
#include "getent.h"

static int
puthostent(const struct hostent *hp, FILE *fp)
{
        char **p;
        int rc = 0;
        char obuf[INET6_ADDRSTRLEN];

        if (hp == NULL) {
                return (1);
        }

        for (p = hp->h_addr_list; *p != 0; p++) {
                void            *addr;
                struct in_addr  in4;
                int             af;
                const char      *res;
                char **q;

                if (hp->h_addrtype == AF_INET6) {
                        if (IN6_IS_ADDR_V4MAPPED((struct in6_addr *)*p)) {
                                IN6_V4MAPPED_TO_INADDR((struct in6_addr *)*p,
                                    &in4);
                                af = AF_INET;
                                addr = &in4;
                        } else {
                                af = AF_INET6;
                                addr = *p;
                        }
                } else {
                        af = AF_INET;
                        addr = *p;
                }
                res = inet_ntop(af, addr, obuf, sizeof (obuf));
                if (res == 0) {
                        rc = 1;
                        continue;
                }
                if (fprintf(fp, "%s\t%s", res, hp->h_name) == EOF)
                        rc = 1;
                for (q = hp->h_aliases; q && *q; q++) {
                        if (fprintf(fp, " %s", *q) == EOF)
                                rc = 1;
                }
                if (putc('\n', fp) == EOF)
                        rc = 1;
        }
        return (rc);
}

/*
 * getipnodebyname/addr - get entries from ipnodes database
 */
int
dogetipnodes(const char **list)
{
        struct hostent *hp;
        int rc = EXC_SUCCESS;
        struct in6_addr in6;
        struct in_addr  in4;
        int             af, len;
        void            *addr;
        int err_ret;

        if (list == NULL || *list == NULL) {
                rc = EXC_ENUM_NOT_SUPPORTED;
        } else {
                for (; *list != NULL; list++) {
                        if (strchr(*list, ':') != 0) {
                                af = AF_INET6;
                                len = sizeof (in6);
                                addr = &in6;
                        } else {
                                af = AF_INET;
                                len = sizeof (in4);
                                addr = &in4;
                        }
                        if (inet_pton(af, *list, addr) == 1)
                                hp = getipnodebyaddr(addr, len, af, &err_ret);
                        else
                                hp = getipnodebyname(*list, AF_INET6,
                                    AI_V4MAPPED|AI_ALL, &err_ret);
                        if (hp == NULL)
                                rc = EXC_NAME_NOT_FOUND;
                        else
                                (void) puthostent(hp, stdout);
                }
        }

        return (rc);
}