NetBSD/dist/bind/bin/named/db_glue.c

650 lines
16 KiB
C

/* $NetBSD: db_glue.c,v 1.3 2001/01/27 07:21:58 itojun Exp $ */
#if !defined(lint) && !defined(SABER)
static const char sccsid[] = "@(#)db_glue.c 4.4 (Berkeley) 6/1/90";
static const char rcsid[] = "Id: db_glue.c,v 8.42 2000/12/23 08:14:35 vixie Exp";
#endif /* not lint */
/*
* Copyright (c) 1986, 1988
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
/*
* Portions Copyright (c) 1993 by Digital Equipment Corporation.
*
* 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, and that
* the name of Digital Equipment Corporation not be used in advertising or
* publicity pertaining to distribution of the document or software without
* specific, written prior permission.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
* WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT
* CORPORATION 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.
*/
/*
* Portions Copyright (c) 1996-2000 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 INTERNET SOFTWARE CONSORTIUM DISCLAIMS
* ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
* CONSORTIUM 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.
*/
#include "port_before.h"
#include <sys/types.h>
#include <sys/uio.h>
#include <sys/param.h>
#include <sys/stat.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <arpa/nameser.h>
#include <ctype.h>
#include <errno.h>
#include <netdb.h>
#include <resolv.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
#include <time.h>
#include <isc/eventlib.h>
#include <isc/logging.h>
#include <isc/memcluster.h>
#include "port_after.h"
#include "named.h"
struct valuelist {
struct valuelist * next;
struct valuelist * prev;
char * name;
char * proto;
int port;
};
static struct valuelist *servicelist, *protolist;
void
buildservicelist() {
struct servent *sp;
struct valuelist *slp;
#ifdef MAYBE_HESIOD
setservent(0);
#else
setservent(1);
#endif
while ((sp = getservent()) != NULL) {
slp = (struct valuelist *)memget(sizeof(struct valuelist));
if (!slp)
panic("memget(servent)", NULL);
slp->name = savestr(sp->s_name, 1);
slp->proto = savestr(sp->s_proto, 1);
slp->port = ntohs((u_int16_t)sp->s_port); /* host byt order */
slp->next = servicelist;
slp->prev = NULL;
if (servicelist)
servicelist->prev = slp;
servicelist = slp;
}
endservent();
}
void
destroyservicelist() {
struct valuelist *slp, *slp_next;
for (slp = servicelist; slp != NULL; slp = slp_next) {
slp_next = slp->next;
freestr(slp->name);
freestr(slp->proto);
memput(slp, sizeof *slp);
}
servicelist = NULL;
}
void
buildprotolist() {
struct protoent *pp;
struct valuelist *slp;
#ifdef MAYBE_HESIOD
setprotoent(0);
#else
setprotoent(1);
#endif
while ((pp = getprotoent()) != NULL) {
slp = (struct valuelist *)memget(sizeof(struct valuelist));
if (!slp)
panic("memget(protoent)", NULL);
slp->name = savestr(pp->p_name, 1);
slp->port = pp->p_proto; /* host byte order */
slp->next = protolist;
slp->prev = NULL;
if (protolist)
protolist->prev = slp;
protolist = slp;
}
endprotoent();
}
void
destroyprotolist() {
struct valuelist *plp, *plp_next;
for (plp = protolist; plp != NULL; plp = plp_next) {
plp_next = plp->next;
freestr(plp->name);
memput(plp, sizeof *plp);
}
protolist = NULL;
}
static int
findservice(const char *s, struct valuelist **list) {
struct valuelist *lp = *list;
int n;
for (; lp != NULL; lp = lp->next)
if (strcasecmp(lp->name, s) == 0) {
if (lp != *list) {
lp->prev->next = lp->next;
if (lp->next)
lp->next->prev = lp->prev;
(*list)->prev = lp;
lp->next = *list;
*list = lp;
}
return (lp->port); /* host byte order */
}
if (sscanf(s, "%d", &n) != 1 || n <= 0)
n = -1;
return (n);
}
/*
* Convert service name or (ascii) number to int.
*/
int
servicenumber(const char *p) {
return (findservice(p, &servicelist));
}
/*
* Convert protocol name or (ascii) number to int.
*/
int
protocolnumber(const char *p) {
return (findservice(p, &protolist));
}
static struct servent *
cgetservbyport(u_int16_t port, const char *proto) { /* Host byte order. */
struct valuelist **list = &servicelist;
struct valuelist *lp = *list;
static struct servent serv;
port = ntohs(port);
for (; lp != NULL; lp = lp->next) {
if (port != (u_int16_t)lp->port) /* Host byte order. */
continue;
if (strcasecmp(lp->proto, proto) == 0) {
if (lp != *list) {
lp->prev->next = lp->next;
if (lp->next)
lp->next->prev = lp->prev;
(*list)->prev = lp;
lp->next = *list;
*list = lp;
}
serv.s_name = lp->name;
serv.s_port = htons((u_int16_t)lp->port);
serv.s_proto = lp->proto;
return (&serv);
}
}
return (0);
}
static struct protoent *
cgetprotobynumber(int proto) { /* Host byte order. */
struct valuelist **list = &protolist;
struct valuelist *lp = *list;
static struct protoent prot;
for (; lp != NULL; lp = lp->next)
if (lp->port == proto) { /* Host byte order. */
if (lp != *list) {
lp->prev->next = lp->next;
if (lp->next)
lp->next->prev = lp->prev;
(*list)->prev = lp;
lp->next = *list;
*list = lp;
}
prot.p_name = lp->name;
prot.p_proto = lp->port; /* Host byte order. */
return (&prot);
}
return (0);
}
const char *
protocolname(int num) {
static char number[8];
struct protoent *pp;
pp = cgetprotobynumber(num);
if (pp == 0) {
(void) sprintf(number, "%d", num);
return (number);
}
return (pp->p_name);
}
const char *
servicename(u_int16_t port, const char *proto) { /* Host byte order. */
static char number[8];
struct servent *ss;
ss = cgetservbyport(htons(port), proto);
if (ss == 0) {
(void) sprintf(number, "%d", port);
return (number);
}
return (ss->s_name);
}
static struct map map_class[] = {
{ "in", C_IN },
{ "chaos", C_CHAOS },
{ "hs", C_HS },
{ NULL, 0 }
};
int
get_class(const char *class) {
const struct map *mp;
if (isdigit(*class))
return (atoi(class));
for (mp = map_class; mp->token != NULL; mp++)
if (strcasecmp(class, mp->token) == 0)
return (mp->val);
return (C_IN);
}
/* rm_datum(dp, np, pdp, savedpp)
* remove datum 'dp' from name 'np'. pdp is previous data pointer.
* if savedpp is not NULL, and compiled with BIND_UPDATE, save
* datum dp there rather than freeing the memory (caller will take
* care of freeing it)
* return value:
* "next" field from removed datum, suitable for relinking
*/
struct databuf *
rm_datum(struct databuf *dp, struct namebuf *np, struct databuf *pdp,
struct databuf **savedpp) {
struct databuf *ndp = dp->d_next;
ns_debug(ns_log_db, 3, "rm_datum(%lx, %lx, %lx, %lx) -> %lx",
(u_long)dp, (u_long)np->n_data, (u_long)pdp,
(u_long)savedpp, (u_long)ndp);
if ((dp->d_flags & DB_F_ACTIVE) == 0)
panic("rm_datum: DB_F_ACTIVE not set", NULL);
if (pdp == NULL)
np->n_data = ndp;
else
pdp->d_next = ndp;
if (savedpp != NULL) {
/* mark deleted or pending deletion */
dp->d_mark |= D_MARK_DELETED;
dp->d_next = *savedpp;
DRCNTINC(dp);
*savedpp = dp;
} else
dp->d_next = NULL;
dp->d_flags &= ~DB_F_ACTIVE;
DRCNTDEC(dp);
if (dp->d_rcnt) {
#ifdef DEBUG
int32_t ii;
#endif
switch(dp->d_type) {
case T_NS:
ns_debug(ns_log_db, 3, "rm_datum: %s rcnt = %d",
dp->d_data, dp->d_rcnt);
break;
#ifdef DEBUG
case T_A:
memcpy(&ii, dp->d_data, sizeof ii);
ns_debug(ns_log_db, 3,
"rm_datum: %08.8X rcnt = %d",
ii, dp->d_rcnt);
break;
#endif
default:
ns_debug(ns_log_db, 3,
"rm_datum: rcnt = %d", dp->d_rcnt);
}
} else
db_freedata(dp);
return (ndp);
}
/* rm_name(np, he, pnp)
* remove name 'np' from parent 'pp'. pnp is previous name pointer.
* return value:
* "next" field from removed name, suitable for relinking.
*/
struct namebuf *
rm_name(struct namebuf *np, struct namebuf **pp, struct namebuf *pnp) {
struct namebuf *nnp = np->n_next;
const char *msg;
/* verify */
if ( (np->n_data && (msg = "data"))
|| (np->n_hash && (msg = "hash"))
) {
ns_panic(ns_log_db, 1, "rm_name(%p(%s)): non-nil %s pointer",
np, NAME(*np), msg);
}
/* unlink */
if (pnp)
pnp->n_next = nnp;
else
*pp = nnp;
/* deallocate */
memput(np, NAMESIZE(NAMELEN(*np)));
/* done */
return (nnp);
}
void
rm_hash(struct hashbuf *htp) {
REQUIRE(htp != NULL);
REQUIRE(htp->h_cnt == 0);
memput(htp, HASHSIZE(htp->h_size));
}
/*
* Get the domain name of 'np' and put in 'buf'. Bounds checking is done.
*/
void
getname(struct namebuf *np, char *buf, int buflen) {
char *cp;
int i;
cp = buf;
while (np != NULL) {
i = (int) NAMELEN(*np);
if (i + 1 >= buflen) {
strcpy(buf, "Name_Too_Long");
return;
}
if (cp != buf)
*cp++ = '.';
memcpy(cp, NAME(*np), i);
cp += i;
buflen -= i + 1;
np = np->n_parent;
}
*cp = '\0';
}
/* u_int
* nhash(name)
* compute hash for this name and return it; ignore case differences
* note:
* this logic is intended to produce the same result as nlookup()'s.
*/
u_int
nhash(const char *name) {
u_char ch;
u_int hval;
hval = 0;
while ((ch = (u_char)*name++) != (u_char)'\0')
HASHIMILATE(hval, ch);
return (hval);
}
void
db_freedata(struct databuf *dp) {
int bytes = DATASIZE(dp->d_size);
if (dp->d_rcnt != 0)
panic("db_freedata: d_rcnt != 0", NULL);
if ((dp->d_flags & (DB_F_ACTIVE|DB_F_FREE)) != 0)
panic("db_freedata: %s set",
(dp->d_flags & DB_F_FREE) != 0 ? "DB_F_FREE" :
"DB_F_ACTIVE");
if (dp->d_next != NULL)
panic("db_free: d_next != NULL", NULL);
dp->d_flags |= DB_F_FREE;
memput(dp, bytes);
}
struct lame_hash {
struct lame_hash *next;
char *zone;
char *server;
time_t when;
unsigned int hval;
} **lame_hash = NULL;
static int lame_hash_size = 0;
static int lame_hash_cnt = 0;
void
db_lame_add(char *zone, char *server, time_t when) {
unsigned int hval = nhash(zone);
struct lame_hash *last, *this;
struct lame_hash **new;
int n;
int newsize;
db_lame_clean();
/* grow / initalise hash table */
if (lame_hash_cnt >= lame_hash_size) {
if (lame_hash_size == 0)
newsize = hashsizes[0];
else {
for (n = 0; (newsize = hashsizes[n++]) != 0; (void)NULL)
if (lame_hash_size == newsize) {
newsize = hashsizes[n];
break;
}
if (newsize == 0)
newsize = lame_hash_size * 2 + 1;
}
new = memget(newsize * sizeof this);
if (new == NULL)
return;
memset(new, 0, newsize * sizeof this);
for (n = 0 ; n < lame_hash_size; n++) {
this = lame_hash[n];
while (this) {
last = this;
this = this->next;
last->next = new[hval%newsize];
new[hval%newsize] = last;
}
}
if (lame_hash != NULL)
memput(lame_hash, lame_hash_size * sizeof this);
lame_hash = new;
lame_hash_size = newsize;
}
last = NULL;
this = lame_hash[hval%lame_hash_size];
while (this) {
if ((ns_samename(this->server, server) == 1) &&
(ns_samename(this->zone, zone) == 1)) {
this->when = when;
return;
}
last = this;
this = this->next;
}
this = memget(sizeof *this);
if (this == NULL)
return;
this->server = savestr(server, 0);
this->zone = savestr(zone, 0);
if (this->server == NULL || this->zone == NULL) {
if (this->server != NULL)
freestr(this->server);
if (this->zone != NULL)
freestr(this->zone);
memput(this, sizeof *this);
return;
}
this->when = when;
this->hval = hval;
this->next = NULL;
if (last != NULL)
last->next = this;
else
lame_hash[hval%lame_hash_size] = this;
lame_hash_cnt++;
}
time_t
db_lame_find(char *zone, struct databuf *dp) {
unsigned int hval = nhash(zone);
struct lame_hash *this;
if (lame_hash_size == 0) {
/* db_lame_destroy() must have been called. */
dp->d_flags &= ~DB_F_LAME;
return (0);
}
db_lame_clean(); /* Remove expired record so that we can
* clear DB_F_LAME when there are no
* additions. */
this = lame_hash[hval % lame_hash_size];
while (this) {
if ((ns_samename(this->server, (char*)dp->d_data) == 1) &&
(ns_samename(this->zone, zone) == 1))
return (this->when);
this = this->next;
}
dp->d_flags &= ~DB_F_LAME;
return (0);
}
void
db_lame_clean(void) {
int i;
struct lame_hash *last, *this;
for (i = 0 ; i < lame_hash_size; i++) {
last = NULL;
this = lame_hash[i];
while (this != NULL) {
if (this->when < tt.tv_sec) {
freestr(this->zone);
freestr(this->server);
if (last != NULL) {
last->next = this->next;
memput(this, sizeof *this);
this = last->next;
} else {
lame_hash[i] = this->next;
memput(this, sizeof *this);
this = lame_hash[i];
}
lame_hash_cnt--;
} else {
last = this;
this = this->next;
}
}
}
}
void
db_lame_destroy(void) {
int i;
struct lame_hash *last, *this;
if (lame_hash_size == 0)
return;
for (i = 0 ; i < lame_hash_size; i++) {
this = lame_hash[i];
while (this != NULL) {
last = this;
this = this->next;
freestr(last->zone);
freestr(last->server);
memput(last, sizeof *this);
}
}
memput(lame_hash, lame_hash_size * sizeof this);
lame_hash_cnt = 0;
lame_hash_size = 0;
lame_hash = NULL;
}