6b6ac9438f
package does have BXA export approval, but the licensing strings on the dnssafe code are a bit unpleasant. The crypto is easy to restore and bind will run without it - just without full dnssec support. Obtained from: The Internet Software Consortium (www.isc.org)
391 lines
9.3 KiB
C
391 lines
9.3 KiB
C
/*
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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(LIBC_SCCS) && !defined(lint)
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static const char rcsid[] = "$Id: nis_ho.c,v 1.16 1999/10/13 16:39:32 vixie Exp $";
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#endif /* LIBC_SCCS and not lint */
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/* Imports */
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#include "port_before.h"
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#ifndef WANT_IRS_NIS
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static int __bind_irs_nis_unneeded;
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#else
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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 <rpc/rpc.h>
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#include <rpc/xdr.h>
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#include <rpcsvc/yp_prot.h>
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#include <rpcsvc/ypclnt.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 <isc/memcluster.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 "nis_p.h"
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/* Definitions */
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#define MAXALIASES 35
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#define MAXADDRS 35
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#if PACKETSZ > 1024
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#define MAXPACKET PACKETSZ
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#else
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#define MAXPACKET 1024
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#endif
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struct pvt {
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int needrewind;
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char * nis_domain;
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char * curkey_data;
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int curkey_len;
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char * curval_data;
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int curval_len;
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struct hostent host;
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char * h_addr_ptrs[MAXADDRS + 1];
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char * host_aliases[MAXALIASES + 1];
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char hostbuf[8*1024];
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u_char host_addr[16]; /* IPv4 or IPv6 */
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struct __res_state *res;
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void (*free_res)(void *);
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};
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enum do_what { do_none = 0x0, do_key = 0x1, do_val = 0x2, do_all = 0x3 };
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static const u_char mapped[] = { 0,0, 0,0, 0,0, 0,0, 0,0, 0xff,0xff };
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static const u_char tunnelled[] = { 0,0, 0,0, 0,0, 0,0, 0,0, 0,0 };
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static /*const*/ char hosts_byname[] = "hosts.byname";
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static /*const*/ char hosts_byaddr[] = "hosts.byaddr";
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/* Forwards */
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static void ho_close(struct irs_ho *this);
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static struct hostent * ho_byname(struct irs_ho *this, const char *name);
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static struct hostent * ho_byname2(struct irs_ho *this, const char *name,
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int af);
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static struct hostent * ho_byaddr(struct irs_ho *this, const void *addr,
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int len, int af);
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static struct hostent * ho_next(struct irs_ho *this);
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static void ho_rewind(struct irs_ho *this);
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static void ho_minimize(struct irs_ho *this);
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static struct __res_state * ho_res_get(struct irs_ho *this);
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static void ho_res_set(struct irs_ho *this,
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struct __res_state *res,
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void (*free_res)(void *));
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static struct hostent * makehostent(struct irs_ho *this);
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static void nisfree(struct pvt *, enum do_what);
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static int init(struct irs_ho *this);
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/* Public */
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struct irs_ho *
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irs_nis_ho(struct irs_acc *this) {
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struct irs_ho *ho;
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struct pvt *pvt;
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if (!(pvt = memget(sizeof *pvt))) {
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errno = ENOMEM;
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return (NULL);
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}
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memset(pvt, 0, sizeof *pvt);
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if (!(ho = memget(sizeof *ho))) {
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memput(pvt, sizeof *pvt);
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errno = ENOMEM;
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return (NULL);
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}
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memset(ho, 0x5e, sizeof *ho);
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pvt->needrewind = 1;
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pvt->nis_domain = ((struct nis_p *)this->private)->domain;
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ho->private = pvt;
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ho->close = ho_close;
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ho->byname = ho_byname;
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ho->byname2 = ho_byname2;
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ho->byaddr = ho_byaddr;
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ho->next = ho_next;
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ho->rewind = ho_rewind;
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ho->minimize = ho_minimize;
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ho->res_set = ho_res_set;
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ho->res_get = ho_res_get;
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return (ho);
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}
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/* Methods */
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static void
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ho_close(struct irs_ho *this) {
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struct pvt *pvt = (struct pvt *)this->private;
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ho_minimize(this);
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nisfree(pvt, do_all);
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if (pvt->res && pvt->free_res)
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(*pvt->free_res)(pvt->res);
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memput(pvt, sizeof *pvt);
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memput(this, sizeof *this);
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}
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static struct hostent *
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ho_byname(struct irs_ho *this, const char *name) {
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struct pvt *pvt = (struct pvt *)this->private;
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struct hostent *hp;
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if (init(this) == -1)
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return (NULL);
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if (pvt->res->options & RES_USE_INET6) {
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hp = ho_byname2(this, name, AF_INET6);
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if (hp)
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return (hp);
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}
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return (ho_byname2(this, name, AF_INET));
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}
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static struct hostent *
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ho_byname2(struct irs_ho *this, const char *name, int af) {
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struct pvt *pvt = (struct pvt *)this->private;
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int r;
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if (init(this) == -1)
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return (NULL);
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nisfree(pvt, do_val);
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r = yp_match(pvt->nis_domain, hosts_byname, (char *)name, strlen(name),
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&pvt->curval_data, &pvt->curval_len);
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if (r != 0) {
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RES_SET_H_ERRNO(pvt->res, HOST_NOT_FOUND);
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return (NULL);
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}
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return (makehostent(this));
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}
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static struct hostent *
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ho_byaddr(struct irs_ho *this, const void *addr, int len, int af) {
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struct pvt *pvt = (struct pvt *)this->private;
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char tmp[sizeof "ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255"];
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const u_char *uaddr = addr;
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int r;
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if (init(this) == -1)
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return (NULL);
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if (af == AF_INET6 && len == IN6ADDRSZ &&
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(!memcmp(uaddr, mapped, sizeof mapped) ||
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!memcmp(uaddr, tunnelled, sizeof tunnelled))) {
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/* Unmap. */
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addr = (u_char *)addr + sizeof mapped;
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uaddr += sizeof mapped;
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af = AF_INET;
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len = INADDRSZ;
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}
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if (inet_ntop(af, uaddr, tmp, sizeof tmp) == NULL) {
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RES_SET_H_ERRNO(pvt->res, NETDB_INTERNAL);
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return (NULL);
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}
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nisfree(pvt, do_val);
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r = yp_match(pvt->nis_domain, hosts_byaddr, tmp, strlen(tmp),
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&pvt->curval_data, &pvt->curval_len);
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if (r != 0) {
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RES_SET_H_ERRNO(pvt->res, HOST_NOT_FOUND);
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return (NULL);
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}
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return (makehostent(this));
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}
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static struct hostent *
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ho_next(struct irs_ho *this) {
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struct pvt *pvt = (struct pvt *)this->private;
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struct hostent *rval;
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int r;
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if (init(this) == -1)
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return (NULL);
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do {
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if (pvt->needrewind) {
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nisfree(pvt, do_all);
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r = yp_first(pvt->nis_domain, hosts_byaddr,
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&pvt->curkey_data, &pvt->curkey_len,
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&pvt->curval_data, &pvt->curval_len);
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pvt->needrewind = 0;
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} else {
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char *newkey_data;
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int newkey_len;
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nisfree(pvt, do_val);
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r = yp_next(pvt->nis_domain, hosts_byaddr,
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pvt->curkey_data, pvt->curkey_len,
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&newkey_data, &newkey_len,
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&pvt->curval_data, &pvt->curval_len);
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nisfree(pvt, do_key);
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pvt->curkey_data = newkey_data;
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pvt->curkey_len = newkey_len;
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}
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if (r != 0) {
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RES_SET_H_ERRNO(pvt->res, HOST_NOT_FOUND);
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return (NULL);
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}
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rval = makehostent(this);
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} while (rval == NULL);
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return (rval);
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}
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static void
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ho_rewind(struct irs_ho *this) {
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struct pvt *pvt = (struct pvt *)this->private;
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pvt->needrewind = 1;
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}
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static void
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ho_minimize(struct irs_ho *this) {
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struct pvt *pvt = (struct pvt *)this->private;
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if (pvt->res)
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res_nclose(pvt->res);
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}
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static struct __res_state *
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ho_res_get(struct irs_ho *this) {
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struct pvt *pvt = (struct pvt *)this->private;
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if (!pvt->res) {
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struct __res_state *res;
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res = (struct __res_state *)malloc(sizeof *res);
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if (!res) {
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errno = ENOMEM;
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return (NULL);
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}
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memset(res, 0, sizeof *res);
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ho_res_set(this, res, free);
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}
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return (pvt->res);
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}
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static void
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ho_res_set(struct irs_ho *this, struct __res_state *res,
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void (*free_res)(void *)) {
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struct pvt *pvt = (struct pvt *)this->private;
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if (pvt->res && pvt->free_res) {
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res_nclose(pvt->res);
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(*pvt->free_res)(pvt->res);
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}
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pvt->res = res;
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pvt->free_res = free_res;
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}
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/* Private */
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static struct hostent *
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makehostent(struct irs_ho *this) {
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struct pvt *pvt = (struct pvt *)this->private;
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static const char spaces[] = " \t";
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char *cp, **q, *p;
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int af, len;
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p = pvt->curval_data;
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if ((cp = strpbrk(p, "#\n")) != NULL)
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*cp = '\0';
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if (!(cp = strpbrk(p, spaces)))
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return (NULL);
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*cp++ = '\0';
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if ((pvt->res->options & RES_USE_INET6) &&
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inet_pton(AF_INET6, p, pvt->host_addr) > 0) {
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af = AF_INET6;
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len = IN6ADDRSZ;
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} else if (inet_pton(AF_INET, p, pvt->host_addr) > 0) {
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if (pvt->res->options & RES_USE_INET6) {
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map_v4v6_address((char*)pvt->host_addr,
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(char*)pvt->host_addr);
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af = AF_INET6;
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len = IN6ADDRSZ;
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} else {
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af = AF_INET;
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len = INADDRSZ;
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}
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} else {
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return (NULL);
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}
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pvt->h_addr_ptrs[0] = (char *)pvt->host_addr;
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pvt->h_addr_ptrs[1] = NULL;
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pvt->host.h_addr_list = pvt->h_addr_ptrs;
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pvt->host.h_length = len;
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pvt->host.h_addrtype = af;
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cp += strspn(cp, spaces);
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pvt->host.h_name = cp;
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q = pvt->host.h_aliases = pvt->host_aliases;
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if ((cp = strpbrk(cp, spaces)) != NULL)
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*cp++ = '\0';
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while (cp && *cp) {
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if (*cp == ' ' || *cp == '\t') {
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cp++;
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continue;
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}
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if (q < &pvt->host_aliases[MAXALIASES])
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*q++ = cp;
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if ((cp = strpbrk(cp, spaces)) != NULL)
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*cp++ = '\0';
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}
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*q = NULL;
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RES_SET_H_ERRNO(pvt->res, NETDB_SUCCESS);
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return (&pvt->host);
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}
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static void
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nisfree(struct pvt *pvt, enum do_what do_what) {
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if ((do_what & do_key) && pvt->curkey_data) {
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free(pvt->curkey_data);
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pvt->curkey_data = NULL;
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}
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if ((do_what & do_val) && pvt->curval_data) {
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free(pvt->curval_data);
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pvt->curval_data = NULL;
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}
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}
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static int
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init(struct irs_ho *this) {
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struct pvt *pvt = (struct pvt *)this->private;
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if (!pvt->res && !ho_res_get(this))
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return (-1);
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if (((pvt->res->options & RES_INIT) == 0) &&
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res_ninit(pvt->res) == -1)
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return (-1);
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return (0);
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}
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#endif /*WANT_IRS_NIS*/
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