246 lines
6.3 KiB
C
246 lines
6.3 KiB
C
/*-
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* Copyright (c) 1994, Garrett Wollman
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "namespace.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 <netdb.h>
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#include <stdio.h>
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#include <ctype.h>
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#include <errno.h>
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#include <string.h>
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#include <stdarg.h>
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#include <nsswitch.h>
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#include <arpa/nameser.h> /* XXX hack for _res */
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#include <resolv.h> /* XXX hack for _res */
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#include "un-namespace.h"
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extern int _ht_gethostbyname(void *, void *, va_list);
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extern int _dns_gethostbyname(void *, void *, va_list);
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extern int _nis_gethostbyname(void *, void *, va_list);
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extern int _ht_gethostbyaddr(void *, void *, va_list);
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extern int _dns_gethostbyaddr(void *, void *, va_list);
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extern int _nis_gethostbyaddr(void *, void *, va_list);
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extern const char *_res_hostalias(const char *, char *, size_t);
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static struct hostent *gethostbyname_internal(const char *, int);
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/* Host lookup order if nsswitch.conf is broken or nonexistant */
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static const ns_src default_src[] = {
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{ NSSRC_FILES, NS_SUCCESS },
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{ NSSRC_DNS, NS_SUCCESS },
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{ 0 }
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};
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struct hostent *
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gethostbyname(const char *name)
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{
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struct hostent *hp;
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if ((_res.options & RES_INIT) == 0 && res_init() == -1) {
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h_errno = NETDB_INTERNAL;
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return NULL;
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}
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if (_res.options & RES_USE_INET6) {
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hp = gethostbyname_internal(name, AF_INET6);
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if (hp)
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return hp;
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}
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return gethostbyname_internal(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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{
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if ((_res.options & RES_INIT) == 0 && res_init() == -1) {
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h_errno = NETDB_INTERNAL;
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return NULL;
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}
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return gethostbyname_internal(name, af);
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}
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static struct hostent *
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gethostbyname_internal(const char *name, int af)
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{
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const char *cp;
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char *bp, *ep;
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struct hostent *hp = 0;
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int size, rval;
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char abuf[MAXDNAME];
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static struct hostent host;
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static char *h_addr_ptrs[2];
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static char *host_aliases[1];
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static char hostbuf[MAXDNAME + IN6ADDRSZ + sizeof(uint32_t)];
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static uint32_t host_addr[4]; /* IPv4 or IPv6 */
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static const ns_dtab dtab[] = {
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NS_FILES_CB(_ht_gethostbyname, NULL)
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{ NSSRC_DNS, _dns_gethostbyname, NULL },
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NS_NIS_CB(_nis_gethostbyname, NULL) /* force -DHESIOD */
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{ 0 }
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};
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switch (af) {
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case AF_INET:
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size = INADDRSZ;
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break;
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case AF_INET6:
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size = IN6ADDRSZ;
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break;
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default:
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h_errno = NETDB_INTERNAL;
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errno = EAFNOSUPPORT;
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return NULL;
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}
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host.h_addrtype = af;
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host.h_length = size;
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/*
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* if there aren't any dots, it could be a user-level alias.
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* this is also done in res_query() since we are not the only
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* function that looks up host names.
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*/
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if (!strchr(name, '.') &&
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(cp = _res_hostalias(name, abuf, sizeof abuf)))
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name = cp;
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/*
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* disallow names consisting only of digits/dots, unless
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* they end in a dot.
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*/
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if (isdigit((u_char)name[0]))
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for (cp = name;; ++cp) {
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if (!*cp) {
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if (*--cp == '.')
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break;
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/*
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* All-numeric, no dot at the end.
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* Fake up a hostent as if we'd actually
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* done a lookup.
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*/
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if (inet_pton(af, name, host_addr) <= 0) {
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h_errno = HOST_NOT_FOUND;
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return NULL;
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}
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strncpy(hostbuf, name, MAXDNAME);
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hostbuf[MAXDNAME] = '\0';
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bp = hostbuf + MAXDNAME;
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ep = hostbuf + sizeof hostbuf;
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host.h_name = hostbuf;
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host.h_aliases = host_aliases;
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host_aliases[0] = NULL;
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h_addr_ptrs[0] = (char *)host_addr;
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h_addr_ptrs[1] = NULL;
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host.h_addr_list = h_addr_ptrs;
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if (_res.options & RES_USE_INET6)
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_map_v4v6_hostent(&host, &bp, &ep);
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h_errno = NETDB_SUCCESS;
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return &host;
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}
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if (!isdigit((u_char)*cp) && *cp != '.')
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break;
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}
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if ((isxdigit((u_char)name[0]) && strchr(name, ':') != NULL) ||
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name[0] == ':')
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for (cp = name;; ++cp) {
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if (!*cp) {
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if (*--cp == '.')
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break;
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/*
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* All-IPv6-legal, no dot at the end.
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* Fake up a hostent as if we'd actually
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* done a lookup.
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*/
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if (inet_pton(af, name, host_addr) <= 0) {
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h_errno = HOST_NOT_FOUND;
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return NULL;
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}
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strncpy(hostbuf, name, MAXDNAME);
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hostbuf[MAXDNAME] = '\0';
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host.h_name = hostbuf;
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host.h_aliases = host_aliases;
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host_aliases[0] = NULL;
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h_addr_ptrs[0] = (char *)host_addr;
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h_addr_ptrs[1] = NULL;
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host.h_addr_list = h_addr_ptrs;
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h_errno = NETDB_SUCCESS;
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return &host;
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}
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if (!isxdigit((u_char)*cp) && *cp != ':' && *cp != '.')
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break;
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}
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rval = _nsdispatch((void *)&hp, dtab, NSDB_HOSTS, "gethostbyname",
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default_src, name, af);
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if (rval != NS_SUCCESS)
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return NULL;
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else
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return hp;
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}
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struct hostent *
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gethostbyaddr(const char *addr, int len, int type)
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{
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struct hostent *hp = 0;
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int rval;
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static const ns_dtab dtab[] = {
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NS_FILES_CB(_ht_gethostbyaddr, NULL)
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{ NSSRC_DNS, _dns_gethostbyaddr, NULL },
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NS_NIS_CB(_nis_gethostbyaddr, NULL) /* force -DHESIOD */
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{ 0 }
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};
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rval = _nsdispatch((void *)&hp, dtab, NSDB_HOSTS, "gethostbyaddr",
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default_src, addr, len, type);
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if (rval != NS_SUCCESS)
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return NULL;
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else
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return hp;
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}
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void
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sethostent(stayopen)
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int stayopen;
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{
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_sethosthtent(stayopen);
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_sethostdnsent(stayopen);
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}
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void
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endhostent()
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{
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_endhosthtent();
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_endhostdnsent();
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}
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