345 lines
7.8 KiB
C
345 lines
7.8 KiB
C
/* $NetBSD: getnetent.c,v 1.2 2001/01/27 07:22:03 itojun Exp $ */
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/*
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* Copyright (c) 1996,1999 by Internet Software Consortium.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
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* ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
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* CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
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* DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
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* PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
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* ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
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* SOFTWARE.
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*/
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#if !defined(LINT) && !defined(CODECENTER)
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static const char rcsid[] = "Id: getnetent.c,v 1.18 2000/12/23 08:14:53 vixie Exp";
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#endif
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/* Imports */
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#include "port_before.h"
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#if !defined(__BIND_NOSTATIC)
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <arpa/nameser.h>
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#include <arpa/inet.h>
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#include <ctype.h>
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#include <errno.h>
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#include <netdb.h>
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#include <resolv.h>
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#include <stdlib.h>
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#include <string.h>
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#include <irs.h>
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#include "port_after.h"
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#include "irs_p.h"
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#include "irs_data.h"
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/* Definitions */
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struct pvt {
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struct netent netent;
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char * aliases[1];
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char name[MAXDNAME + 1];
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};
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/* Forward */
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static struct net_data *init(void);
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static struct netent *nw_to_net(struct nwent *, struct net_data *);
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static void freepvt(struct net_data *);
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static struct netent *fakeaddr(const char *, int af, struct net_data *);
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/* Portability */
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#ifndef INADDR_NONE
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# define INADDR_NONE 0xffffffff
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#endif
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/* Public */
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struct netent *
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getnetent() {
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struct net_data *net_data = init();
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return (getnetent_p(net_data));
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}
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struct netent *
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getnetbyname(const char *name) {
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struct net_data *net_data = init();
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return (getnetbyname_p(name, net_data));
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}
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struct netent *
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getnetbyaddr(unsigned long net, int type) {
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struct net_data *net_data = init();
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return (getnetbyaddr_p(net, type, net_data));
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}
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void
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setnetent(int stayopen) {
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struct net_data *net_data = init();
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setnetent_p(stayopen, net_data);
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}
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void
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endnetent() {
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struct net_data *net_data = init();
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endnetent_p(net_data);
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}
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/* Shared private. */
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struct netent *
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getnetent_p(struct net_data *net_data) {
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struct irs_nw *nw;
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if (!net_data || !(nw = net_data->nw))
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return (NULL);
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net_data->nww_last = (*nw->next)(nw);
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net_data->nw_last = nw_to_net(net_data->nww_last, net_data);
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return (net_data->nw_last);
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}
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struct netent *
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getnetbyname_p(const char *name, struct net_data *net_data) {
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struct irs_nw *nw;
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struct netent *np;
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char **nap;
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if (!net_data || !(nw = net_data->nw))
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return (NULL);
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if (net_data->nw_stayopen && net_data->nw_last) {
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if (!strcmp(net_data->nw_last->n_name, name))
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return (net_data->nw_last);
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for (nap = net_data->nw_last->n_aliases; nap && *nap; nap++)
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if (!strcmp(name, *nap))
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return (net_data->nw_last);
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}
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if ((np = fakeaddr(name, AF_INET, net_data)) != NULL)
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return (np);
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net_data->nww_last = (*nw->byname)(nw, name, AF_INET);
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net_data->nw_last = nw_to_net(net_data->nww_last, net_data);
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if (!net_data->nw_stayopen)
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endnetent();
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return (net_data->nw_last);
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}
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struct netent *
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getnetbyaddr_p(unsigned long net, int type, struct net_data *net_data) {
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struct irs_nw *nw;
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u_char addr[4];
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int bits;
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if (!net_data || !(nw = net_data->nw))
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return (NULL);
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if (net_data->nw_stayopen && net_data->nw_last)
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if (type == net_data->nw_last->n_addrtype &&
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net == net_data->nw_last->n_net)
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return (net_data->nw_last);
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/* cannonize net(host order) */
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if (net < 256) {
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net <<= 24;
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bits = 8;
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} else if (net < 65536) {
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net <<= 16;
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bits = 16;
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} else if (net < 16777216) {
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net <<= 8;
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bits = 24;
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} else
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bits = 32;
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/* convert to net order */
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addr[0] = (0xFF000000 & net) >> 24;
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addr[1] = (0x00FF0000 & net) >> 16;
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addr[2] = (0x0000FF00 & net) >> 8;
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addr[3] = (0x000000FF & net);
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/* reduce bits to as close to natural number as possible */
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if ((bits == 32) && (addr[0] < 224) && (addr[3] == 0)) {
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if ((addr[0] < 192) && (addr[2] == 0)) {
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if ((addr[0] < 128) && (addr[1] == 0))
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bits = 8;
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else
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bits = 16;
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} else {
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bits = 24;
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}
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}
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net_data->nww_last = (*nw->byaddr)(nw, addr, bits, AF_INET);
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net_data->nw_last = nw_to_net(net_data->nww_last, net_data);
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if (!net_data->nw_stayopen)
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endnetent();
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return (net_data->nw_last);
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}
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void
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setnetent_p(int stayopen, struct net_data *net_data) {
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struct irs_nw *nw;
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if (!net_data || !(nw = net_data->nw))
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return;
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freepvt(net_data);
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(*nw->rewind)(nw);
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net_data->nw_stayopen = (stayopen != 0);
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if (stayopen == 0)
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net_data_minimize(net_data);
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}
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void
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endnetent_p(struct net_data *net_data) {
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struct irs_nw *nw;
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if ((net_data != NULL) && ((nw = net_data->nw) != NULL))
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(*nw->minimize)(nw);
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}
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/* Private */
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static struct net_data *
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init() {
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struct net_data *net_data;
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if (!(net_data = net_data_init(NULL)))
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goto error;
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if (!net_data->nw) {
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net_data->nw = (*net_data->irs->nw_map)(net_data->irs);
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if (!net_data->nw || !net_data->res) {
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error:
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errno = EIO;
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return (NULL);
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}
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(*net_data->nw->res_set)(net_data->nw, net_data->res, NULL);
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}
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return (net_data);
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}
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static void
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freepvt(struct net_data *net_data) {
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if (net_data->nw_data) {
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free(net_data->nw_data);
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net_data->nw_data = NULL;
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}
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}
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static struct netent *
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fakeaddr(const char *name, int af, struct net_data *net_data) {
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struct pvt *pvt;
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const char *cp;
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u_long tmp;
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if (af != AF_INET) {
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/* XXX should support IPv6 some day */
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errno = EAFNOSUPPORT;
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RES_SET_H_ERRNO(net_data->res, NETDB_INTERNAL);
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return (NULL);
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}
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if (!isascii(name[0]) || !isdigit(name[0]))
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return (NULL);
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for (cp = name; *cp; ++cp)
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if (!isascii(*cp) || (!isdigit(*cp) && *cp != '.'))
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return (NULL);
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if (*--cp == '.')
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return (NULL);
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/* All-numeric, no dot at the end. */
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tmp = inet_network(name);
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if (tmp == INADDR_NONE) {
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RES_SET_H_ERRNO(net_data->res, HOST_NOT_FOUND);
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return (NULL);
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}
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/* Valid network number specified.
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* Fake up a netent as if we'd actually
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* done a lookup.
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*/
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freepvt(net_data);
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net_data->nw_data = malloc(sizeof (struct pvt));
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if (!net_data->nw_data) {
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errno = ENOMEM;
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RES_SET_H_ERRNO(net_data->res, NETDB_INTERNAL);
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return (NULL);
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}
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pvt = net_data->nw_data;
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strncpy(pvt->name, name, MAXDNAME);
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pvt->name[MAXDNAME] = '\0';
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pvt->netent.n_name = pvt->name;
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pvt->netent.n_addrtype = AF_INET;
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pvt->netent.n_aliases = pvt->aliases;
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pvt->aliases[0] = NULL;
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pvt->netent.n_net = tmp;
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return (&pvt->netent);
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}
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static struct netent *
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nw_to_net(struct nwent *nwent, struct net_data *net_data) {
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struct pvt *pvt;
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u_long addr = 0;
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int i;
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int msbyte;
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if (!nwent || nwent->n_addrtype != AF_INET)
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return (NULL);
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freepvt(net_data);
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net_data->nw_data = malloc(sizeof (struct pvt));
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if (!net_data->nw_data) {
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errno = ENOMEM;
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RES_SET_H_ERRNO(net_data->res, NETDB_INTERNAL);
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return (NULL);
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}
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pvt = net_data->nw_data;
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pvt->netent.n_name = nwent->n_name;
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pvt->netent.n_aliases = nwent->n_aliases;
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pvt->netent.n_addrtype = nwent->n_addrtype;
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/*
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* What this code does: Converts net addresses from network to host form.
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*
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* msbyte: the index of the most significant byte in the n_addr array.
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*
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* Shift bytes in significant order into addr. When all signicant
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* bytes are in, zero out bits in the LSB that are not part of the network.
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*/
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msbyte = nwent->n_length / 8 +
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((nwent->n_length % 8) != 0 ? 1 : 0) - 1;
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for (i = 0; i <= msbyte; i++)
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addr = (addr << 8) | ((unsigned char *)nwent->n_addr)[i];
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i = (32 - nwent->n_length) % 8;
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if (i != 0)
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addr &= ~((1 << (i + 1)) - 1);
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pvt->netent.n_net = addr;
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return (&pvt->netent);
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}
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#endif /*__BIND_NOSTATIC*/
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