/*
 * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
 * Copyright (c) 1998-1999 by Internet Software Consortium.
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
 * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#include <port_before.h>
#if !defined(_REENTRANT) || !defined(DO_PTHREADS)
        static int gethostent_r_not_required = 0;
#else
#include <errno.h>
#include <string.h>
#include <stdio.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <netdb.h>
#include <sys/param.h>
#include <port_after.h>

#ifdef HOST_R_RETURN

static HOST_R_RETURN
copy_hostent(struct hostent *, struct hostent *, HOST_R_COPY_ARGS);

HOST_R_RETURN
gethostbyname_r(const char *name,  struct hostent *hptr, HOST_R_ARGS) {
        struct hostent *he = gethostbyname(name);
#ifdef HOST_R_SETANSWER
        int n = 0;
#endif

#ifdef HOST_R_ERRNO
        HOST_R_ERRNO;
#endif

#ifdef HOST_R_SETANSWER
        if (he == NULL || (n = copy_hostent(he, hptr, HOST_R_COPY)) != 0)
                *answerp = NULL;
        else
                *answerp = hptr;

        return (n);
#else
        if (he == NULL)
                return (HOST_R_BAD);

        return (copy_hostent(he, hptr, HOST_R_COPY));
#endif
}

HOST_R_RETURN
gethostbyaddr_r(const char *addr, int len, int type,
                struct hostent *hptr, HOST_R_ARGS) {
        struct hostent *he = gethostbyaddr(addr, len, type);
#ifdef HOST_R_SETANSWER
        int n = 0;
#endif

#ifdef HOST_R_ERRNO
        HOST_R_ERRNO;
#endif

#ifdef HOST_R_SETANSWER
        if (he == NULL || (n = copy_hostent(he, hptr, HOST_R_COPY)) != 0)
                *answerp = NULL;
        else
                *answerp = hptr;

        return (n);
#else
        if (he == NULL)
                return (HOST_R_BAD);

        return (copy_hostent(he, hptr, HOST_R_COPY));
#endif
}

/*%
 *      These assume a single context is in operation per thread.
 *      If this is not the case we will need to call irs directly
 *      rather than through the base functions.
 */

HOST_R_RETURN
gethostent_r(struct hostent *hptr, HOST_R_ARGS) {
        struct hostent *he = gethostent();
#ifdef HOST_R_SETANSWER
        int n = 0;
#endif

#ifdef HOST_R_ERRNO
        HOST_R_ERRNO;
#endif

#ifdef HOST_R_SETANSWER
        if (he == NULL || (n = copy_hostent(he, hptr, HOST_R_COPY)) != 0)
                *answerp = NULL;
        else
                *answerp = hptr;

        return (n);
#else
        if (he == NULL)
                return (HOST_R_BAD);

        return (copy_hostent(he, hptr, HOST_R_COPY));
#endif
}

HOST_R_SET_RETURN
#ifdef HOST_R_ENT_ARGS
sethostent_r(int stay_open, HOST_R_ENT_ARGS)
#else
sethostent_r(int stay_open)
#endif
{
#ifdef HOST_R_ENT_ARGS
        UNUSED(hdptr);
#endif
        sethostent(stay_open);
#ifdef  HOST_R_SET_RESULT
        return (HOST_R_SET_RESULT);
#endif
}

HOST_R_END_RETURN
#ifdef HOST_R_ENT_ARGS
endhostent_r(HOST_R_ENT_ARGS)
#else
endhostent_r(void)
#endif
{
#ifdef HOST_R_ENT_ARGS
        UNUSED(hdptr);
#endif
        endhostent();
        HOST_R_END_RESULT(HOST_R_OK);
}

/* Private */

#ifndef HOSTENT_DATA
static HOST_R_RETURN
copy_hostent(struct hostent *he, struct hostent *hptr, HOST_R_COPY_ARGS) {
        char *cp;
        char **ptr;
        int i, n;
        int nptr, len;

        /* Find out the amount of space required to store the answer. */
        nptr = 2; /*%< NULL ptrs */
        len = (char *)ALIGN(buf) - buf;
        for (i = 0; he->h_addr_list[i]; i++, nptr++) {
                len += he->h_length;
        }
        for (i = 0; he->h_aliases[i]; i++, nptr++) {
                len += strlen(he->h_aliases[i]) + 1;
        }
        len += strlen(he->h_name) + 1;
        len += nptr * sizeof(char*);

        if (len > buflen) {
                errno = ERANGE;
                return (HOST_R_BAD);
        }

        /* copy address size and type */
        hptr->h_addrtype = he->h_addrtype;
        n = hptr->h_length = he->h_length;

        ptr = (char **)ALIGN(buf);
        cp = (char *)ALIGN(buf) + nptr * sizeof(char *);

        /* copy address list */
        hptr->h_addr_list = ptr;
        for (i = 0; he->h_addr_list[i]; i++ , ptr++) {
                memcpy(cp, he->h_addr_list[i], n);
                hptr->h_addr_list[i] = cp;
                cp += n;
        }
        hptr->h_addr_list[i] = NULL;
        ptr++;

        /* copy official name */
        n = strlen(he->h_name) + 1;
        strcpy(cp, he->h_name);
        hptr->h_name = cp;
        cp += n;

        /* copy aliases */
        hptr->h_aliases = ptr;
        for (i = 0 ; he->h_aliases[i]; i++) {
                n = strlen(he->h_aliases[i]) + 1;
                strcpy(cp, he->h_aliases[i]);
                hptr->h_aliases[i] = cp;
                cp += n;
        }
        hptr->h_aliases[i] = NULL;

        return (HOST_R_OK);
}
#else /* !HOSTENT_DATA */
static int
copy_hostent(struct hostent *he, struct hostent *hptr, HOST_R_COPY_ARGS) {
        char *cp, *eob;
        int i, n;

        /* copy address size and type */
        hptr->h_addrtype = he->h_addrtype;
        n = hptr->h_length = he->h_length;

        /* copy up to first 35 addresses */
        i = 0;
        cp = hdptr->hostbuf;
        eob = hdptr->hostbuf + sizeof(hdptr->hostbuf);
        hptr->h_addr_list = hdptr->h_addr_ptrs;
        while (he->h_addr_list[i] && i < (_MAXADDRS)) {
                if (n < (eob - cp)) {
                        memcpy(cp, he->h_addr_list[i], n);
                        hptr->h_addr_list[i] = cp;
                        cp += n;
                } else {
                        break;
                }
                i++;
        }
        hptr->h_addr_list[i] = NULL;

        /* copy official name */
        if ((n = strlen(he->h_name) + 1) < (eob - cp)) {
                strcpy(cp, he->h_name);
                hptr->h_name = cp;
                cp += n;
        } else {
                return (-1);
        }

        /* copy aliases */
        i = 0;
        hptr->h_aliases = hdptr->host_aliases;
        while (he->h_aliases[i] && i < (_MAXALIASES-1)) {
                if ((n = strlen(he->h_aliases[i]) + 1) < (eob - cp)) {
                        strcpy(cp, he->h_aliases[i]);
                        hptr->h_aliases[i] = cp;
                        cp += n;
                } else {
                        break;
                }
                i++;
        }
        hptr->h_aliases[i] = NULL;

        return (HOST_R_OK);
}
#endif /* !HOSTENT_DATA */
#else /* HOST_R_RETURN */
        static int gethostent_r_unknown_system = 0;
#endif /* HOST_R_RETURN */
#endif /* !defined(_REENTRANT) || !defined(DO_PTHREADS) */
/*! \file */