common/irs/getnetent_r.c

/*
 * 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.
 */

#if defined(LIBC_SCCS) && !defined(lint)
static const char rcsid[] = "$Id: getnetent_r.c,v 1.6 2005/09/03 12:41:38 marka Exp $";
#endif /* LIBC_SCCS and not lint */

#include <port_before.h>
#if !defined(_REENTRANT) || !defined(DO_PTHREADS)
    static int getnetent_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 NET_R_RETURN

static NET_R_RETURN
copy_netent(struct netent *, struct netent *, NET_R_COPY_ARGS);

NET_R_RETURN
getnetbyname_r(const char *name,  struct netent *nptr, NET_R_ARGS) {
    struct netent *ne = getnetbyname(name);
#ifdef NET_R_SETANSWER
    int n = 0;

    if (ne == NULL || (n = copy_netent(ne, nptr, NET_R_COPY)) != 0)
        *answerp = NULL;
    else
        *answerp = ne;
    if (ne == NULL)
        *h_errnop = h_errno;
    return (n);
#else
    if (ne == NULL)
        return (NET_R_BAD);

    return (copy_netent(ne, nptr, NET_R_COPY));
#endif
}

#ifndef GETNETBYADDR_ADDR_T
#define GETNETBYADDR_ADDR_T long
#endif
NET_R_RETURN
getnetbyaddr_r(GETNETBYADDR_ADDR_T addr, int type, struct netent *nptr, NET_R_ARGS) {
    struct netent *ne = getnetbyaddr(addr, type);
#ifdef NET_R_SETANSWER
    int n = 0;

    if (ne == NULL || (n = copy_netent(ne, nptr, NET_R_COPY)) != 0)
        *answerp = NULL;
    else
        *answerp = ne;
    if (ne == NULL)
        *h_errnop = h_errno;
    return (n);
#else

    if (ne == NULL)
        return (NET_R_BAD);

    return (copy_netent(ne, nptr, NET_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.
 */

NET_R_RETURN
getnetent_r(struct netent *nptr, NET_R_ARGS) {
    struct netent *ne = getnetent();
#ifdef NET_R_SETANSWER
    int n = 0;

    if (ne == NULL || (n = copy_netent(ne, nptr, NET_R_COPY)) != 0)
        *answerp = NULL;
    else
        *answerp = ne;
    if (ne == NULL)
        *h_errnop = h_errno;
    return (n);
#else

    if (ne == NULL)
        return (NET_R_BAD);

    return (copy_netent(ne, nptr, NET_R_COPY));
#endif
}

NET_R_SET_RETURN
#ifdef NET_R_ENT_ARGS
setnetent_r(int stay_open, NET_R_ENT_ARGS)
#else
setnetent_r(int stay_open)
#endif
{
#ifdef NET_R_ENT_ARGS
    UNUSED(ndptr);
#endif
    setnetent(stay_open);
#ifdef NET_R_SET_RESULT
    return (NET_R_SET_RESULT);
#endif
}

NET_R_END_RETURN
#ifdef NET_R_ENT_ARGS
endnetent_r(NET_R_ENT_ARGS)
#else
endnetent_r()
#endif
{
#ifdef NET_R_ENT_ARGS
    UNUSED(ndptr);
#endif
    endnetent();
    NET_R_END_RESULT(NET_R_OK);
}

/* Private */

#ifndef NETENT_DATA
static NET_R_RETURN
copy_netent(struct netent *ne, struct netent *nptr, NET_R_COPY_ARGS) {
    char *cp;
    int i, n;
    int numptr, len;

    /* Find out the amount of space required to store the answer. */
    numptr = 1; /*%< NULL ptr */
    len = (char *)ALIGN(buf) - buf;
    for (i = 0; ne->n_aliases[i]; i++, numptr++) {
        len += strlen(ne->n_aliases[i]) + 1;
    }
    len += strlen(ne->n_name) + 1;
    len += numptr * sizeof(char*);

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

    /* copy net value and type */
    nptr->n_addrtype = ne->n_addrtype;
    nptr->n_net = ne->n_net;

    cp = (char *)ALIGN(buf) + numptr * sizeof(char *);

    /* copy official name */
    n = strlen(ne->n_name) + 1;
    strcpy(cp, ne->n_name);
    nptr->n_name = cp;
    cp += n;

    /* copy aliases */
    nptr->n_aliases = (char **)ALIGN(buf);
    for (i = 0 ; ne->n_aliases[i]; i++) {
        n = strlen(ne->n_aliases[i]) + 1;
        strcpy(cp, ne->n_aliases[i]);
        nptr->n_aliases[i] = cp;
        cp += n;
    }
    nptr->n_aliases[i] = NULL;

    return (NET_R_OK);
}
#else /* !NETENT_DATA */
static int
copy_netent(struct netent *ne, struct netent *nptr, NET_R_COPY_ARGS) {
    char *cp, *eob;
    int i, n;

    /* copy net value and type */
    nptr->n_addrtype = ne->n_addrtype;
    nptr->n_net = ne->n_net;

    /* copy official name */
    cp = ndptr->line;
    eob = ndptr->line + sizeof(ndptr->line);
    if ((n = strlen(ne->n_name) + 1) < (eob - cp)) {
        strcpy(cp, ne->n_name);
        nptr->n_name = cp;
        cp += n;
    } else {
        return (-1);
    }

    /* copy aliases */
    i = 0;
    nptr->n_aliases = ndptr->net_aliases;
    while (ne->n_aliases[i] && i < (_MAXALIASES-1)) {
        if ((n = strlen(ne->n_aliases[i]) + 1) < (eob - cp)) {
            strcpy(cp, ne->n_aliases[i]);
            nptr->n_aliases[i] = cp;
            cp += n;
        } else {
            break;
        }
        i++;
    }
    nptr->n_aliases[i] = NULL;

    return (NET_R_OK);
}
#endif /* !NETENT_DATA */
#else /* NET_R_RETURN */
    static int getnetent_r_unknown_system = 0;
#endif /* NET_R_RETURN */
#endif /* !defined(_REENTRANT) || !defined(DO_PTHREADS) */
/*! \file */