/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (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 2008 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 *
 */

/* $Id: misc.c 146 2006-03-24 00:26:54Z njacobs $ */

/*LINTLIBRARY*/

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <ctype.h>
#include <sys/types.h>
#include <papi.h>
#include <uri.h>
#include <config-site.h>

/*
 * The implementations of strlcpy() and strlcat() have been taken directly
 * from OpenSolaris.  The contents of this file originated from
 *     usr/src/lib/libc/port/gen/strlcpy.c
 *     usr/src/lib/libc/port/gen/strcat.c
 */

#ifndef HAVE_STRLCPY
size_t
strlcpy(char *dst, const char *src, size_t len)
{
        size_t slen = strlen(src);
        size_t copied;

        if (len == 0)
                return (slen);

        if (slen >= len)
                copied = len - 1;
        else
                copied = slen;
        (void) memcpy(dst, src, copied);
        dst[copied] = '\0';
        return (slen);
}
#endif

#ifndef HAVE_STRLCAT
size_t
strlcat(char *dst, const char *src, size_t dstsize)
{
        char *df = dst;
        size_t left = dstsize;
        size_t l1;
        size_t l2 = strlen(src);
        size_t copied;

        while (left-- != 0 && *df != '\0')
                df++;
        l1 = df - dst;
        if (dstsize == l1)
                return (l1 + l2);

        copied = l1 + l2 >= dstsize ? dstsize - l1 - 1 : l2;
        (void) memcpy(dst + l1, src, copied);
        dst[l1+copied] = '\0';
        return (l1 + l2);
}
#endif

#if defined(__sun) && defined(__SVR4)
#include <sys/systeminfo.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <sys/sockio.h>
#include <net/if.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>

static struct in6_addr **
local_interfaces()
{
        struct in6_addr **result = NULL;
        int s;
        struct lifnum n;
        struct lifconf c;
        struct lifreq *r;
        int count;

        /* we need a socket to get the interfaces */
        if ((s = socket(AF_INET, SOCK_DGRAM, 0)) < 0)
                return (0);

        /* get the number of interfaces */
        memset(&n, 0, sizeof (n));
        n.lifn_family = AF_UNSPEC;
        if (ioctl(s, SIOCGLIFNUM, (char *)&n) < 0) {
                close(s);
                return (0);     /* no interfaces */
        }

        /* get the interface(s) configuration */
        memset(&c, 0, sizeof (c));
        c.lifc_family = AF_UNSPEC;
        c.lifc_buf = calloc(n.lifn_count, sizeof (struct lifreq));
        c.lifc_len = (n.lifn_count * sizeof (struct lifreq));
        if (ioctl(s, SIOCGLIFCONF, (char *)&c) < 0) {
                free(c.lifc_buf);
                close(s);
                return (0);     /* can't get interface(s) configuration */
        }
        close(s);

        r = c.lifc_req;
        for (count = c.lifc_len / sizeof (struct lifreq);
            count > 0; count--, r++) {
                struct in6_addr v6[1], *addr = NULL;

                switch (r->lifr_addr.ss_family) {
                case AF_INET: {
                        struct sockaddr_in *s =
                            (struct sockaddr_in *)&r->lifr_addr;
                        IN6_INADDR_TO_V4MAPPED(&s->sin_addr, v6);
                        addr = v6;
                        }
                        break;
                case AF_INET6: {
                        struct sockaddr_in6 *s =
                            (struct sockaddr_in6 *)&r->lifr_addr;
                        addr = &s->sin6_addr;
                        }
                        break;
                }

                if (addr != NULL) {
                        struct in6_addr *a = malloc(sizeof (*a));

                        memcpy(a, addr, sizeof (*a));
                        list_append(&result, a);
                }
        }
        free(c.lifc_buf);

        return (result);
}

static int
match_interfaces(char *host)
{
        struct in6_addr **lif = local_interfaces();
        struct hostent *hp;
        int rc = 0;
        int errnum;

        /* are there any local interfaces */
        if (lif == NULL)
                return (0);

        /* cycle through the host db addresses */
        hp = getipnodebyname(host, AF_INET6, AI_ALL|AI_V4MAPPED, &errnum);
        if (hp != NULL) {
                struct in6_addr **tmp = (struct in6_addr **)hp->h_addr_list;
                int i;

                for (i = 0; ((rc == 0) && (tmp[i] != NULL)); i++) {
                        int j;

                        for (j = 0; ((rc == 0) && (lif[j] != NULL)); j++)
                                if (memcmp(tmp[i], lif[j],
                                    sizeof (struct in6_addr)) == 0)
                                        rc = 1;
                }
        }
        free(lif);

        return (rc);
}
#endif

int
is_localhost(char *host)
{
        char hostname[BUFSIZ];

        /* is it "localhost" */
        if (strncasecmp(host, "localhost", 10) == 0)
                return (1);

        /* is it the {nodename} */
        sysinfo(SI_HOSTNAME, hostname, sizeof (hostname));
        if (strncasecmp(host, hostname, strlen(hostname)) == 0)
                return (1);

#if defined(__sun) && defined(__SVR4)
        /* does it match one of the host's configured interfaces */
        if (match_interfaces(host) != 0)
                return (1);
#endif
        return (0);
}