264 lines
6.1 KiB
C
264 lines
6.1 KiB
C
/*
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* Copyright (c) 1996,1997 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 char rcsid[] = "$Id: gethostent.c,v 1.13 1997/12/04 04:57:52 halley Exp $";
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#endif
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/* Imports */
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#include "port_before.h"
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#include <sys/types.h>
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#include <sys/param.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <arpa/nameser.h>
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#include <ctype.h>
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#include <errno.h>
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#include <stdlib.h>
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#include <netdb.h>
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#include <resolv.h>
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#include <stdio.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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char * aliases[1];
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char * addrs[2];
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char addr[NS_IN6ADDRSZ];
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char name[NS_MAXDNAME + 1];
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struct hostent host;
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};
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/* Forward */
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static struct irs_ho * init(void);
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static void freepvt(void);
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static struct hostent * fakeaddr(const char *, int);
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/* Public */
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struct hostent *
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gethostbyname(const char *name) {
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struct hostent *hp;
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if ((_res.options & RES_INIT) == 0 && res_init() == -1)
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return (NULL);
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if (_res.options & RES_USE_INET6) {
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hp = gethostbyname2(name, AF_INET6);
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if (hp)
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return (hp);
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}
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return (gethostbyname2(name, AF_INET));
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}
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struct hostent *
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gethostbyname2(const char *name, int af) {
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struct irs_ho *ho = init();
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struct hostent *hp;
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const char *cp;
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char **hap;
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if (!ho)
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return (NULL);
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if (net_data.ho_stayopen && net_data.ho_last) {
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if (!strcasecmp(name, net_data.ho_last->h_name))
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return (net_data.ho_last);
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for (hap = net_data.ho_last->h_aliases; hap && *hap; hap++)
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if (!strcasecmp(name, *hap))
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return (net_data.ho_last);
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}
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if (!strchr(name, '.') && (cp = hostalias(name)))
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name = cp;
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if ((hp = fakeaddr(name, af)) != NULL)
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return (hp);
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net_data.ho_last = (*ho->byname2)(ho, name, af);
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if (!net_data.ho_stayopen)
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endhostent();
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return (net_data.ho_last);
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}
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struct hostent *
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gethostbyaddr(const char *addr, int len, int af) {
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struct irs_ho *ho = init();
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char **hap;
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if (!ho)
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return (NULL);
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if (net_data.ho_stayopen && net_data.ho_last &&
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net_data.ho_last->h_length == len)
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for (hap = net_data.ho_last->h_addr_list;
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hap && *hap;
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hap++)
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if (!memcmp(addr, *hap, len))
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return (net_data.ho_last);
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net_data.ho_last = (*ho->byaddr)(ho, addr, len, af);
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if (!net_data.ho_stayopen)
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endhostent();
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return (net_data.ho_last);
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}
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struct hostent *
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gethostent() {
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struct irs_ho *ho = init();
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if (!ho)
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return (NULL);
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net_data.ho_last = (*ho->next)(ho);
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return (net_data.ho_last);
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}
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void
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sethostent(int stayopen) {
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struct irs_ho *ho = init();
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if (!ho)
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return;
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freepvt();
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(*ho->rewind)(ho);
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net_data.ho_stayopen = (stayopen != 0);
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}
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void
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endhostent() {
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struct irs_ho *ho = init();
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if (ho != NULL)
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(*ho->minimize)(ho);
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}
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/* Private */
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static struct irs_ho *
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init() {
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if ((_res.options & RES_INIT) == 0 && res_init() == -1)
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return (NULL);
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if (!net_data_init())
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goto error;
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if (!net_data.ho)
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net_data.ho = (*net_data.irs->ho_map)(net_data.irs);
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if (!net_data.ho) {
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error: errno = EIO;
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h_errno = NETDB_INTERNAL;
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return (NULL);
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}
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return (net_data.ho);
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}
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static void
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freepvt() {
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if (net_data.ho_data) {
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free(net_data.ho_data);
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net_data.ho_data = NULL;
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}
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}
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static struct hostent *
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fakeaddr(const char *name, int af) {
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struct pvt *pvt;
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const char *cp;
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freepvt();
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net_data.ho_data = malloc(sizeof(struct pvt));
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if (!net_data.ho_data) {
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errno = ENOMEM;
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h_errno = NETDB_INTERNAL;
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return (NULL);
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}
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pvt = net_data.ho_data;
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/*
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* Unlike its forebear (inet_aton), our friendly inet_pton() is strict
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* in its interpretation of its input, and it will only return "1" if
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* the input string is a formally valid (and thus unambiguous with
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* respect to host names) internet address specification for this AF.
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*
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* This means "telnet 0xdeadbeef" and "telnet 127.1" are dead now.
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*/
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if (inet_pton(af, name, pvt->addr) != 1) {
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h_errno = HOST_NOT_FOUND;
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return (NULL);
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}
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strncpy(pvt->name, name, NS_MAXDNAME);
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pvt->name[NS_MAXDNAME] = '\0';
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pvt->host.h_addrtype = af;
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switch (af) {
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case AF_INET:
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pvt->host.h_length = NS_INADDRSZ;
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break;
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case AF_INET6:
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pvt->host.h_length = NS_IN6ADDRSZ;
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break;
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default:
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errno = EAFNOSUPPORT;
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h_errno = NETDB_INTERNAL;
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return (NULL);
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}
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pvt->host.h_name = pvt->name;
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pvt->host.h_aliases = pvt->aliases;
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pvt->aliases[0] = NULL;
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pvt->addrs[0] = (char *)pvt->addr;
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pvt->addrs[1] = NULL;
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pvt->host.h_addr_list = pvt->addrs;
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if (af == AF_INET && (_res.options & RES_USE_INET6))
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map_v4v6_address(pvt->addr, pvt->addr);
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h_errno = NETDB_SUCCESS;
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return (&pvt->host);
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}
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#ifdef grot /* for future use in gethostbyaddr(), for "SUNSECURITY" */
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struct hostent *rhp;
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char **haddr;
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u_long old_options;
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char hname2[MAXDNAME+1];
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if (af == AF_INET) {
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/*
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* turn off search as the name should be absolute,
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* 'localhost' should be matched by defnames
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*/
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strncpy(hname2, hp->h_name, MAXDNAME);
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hname2[MAXDNAME] = '\0';
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old_options = _res.options;
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_res.options &= ~RES_DNSRCH;
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_res.options |= RES_DEFNAMES;
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if (!(rhp = gethostbyname(hname2))) {
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_res.options = old_options;
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h_errno = HOST_NOT_FOUND;
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return (NULL);
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}
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_res.options = old_options;
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for (haddr = rhp->h_addr_list; *haddr; haddr++)
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if (!memcmp(*haddr, addr, INADDRSZ))
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break;
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if (!*haddr) {
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h_errno = HOST_NOT_FOUND;
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return (NULL);
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}
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}
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#endif /* grot */
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