OpenBSD-4.6/usr.sbin/ypserv/ypserv/ypserv_db.c
/* $OpenBSD: ypserv_db.c,v 1.25 2007/05/29 21:11:10 maja Exp $ */
/*
* Copyright (c) 1994 Mats O Jansson <moj@stacken.kth.se>
* Copyright (c) 1996 Charles D. Cranor
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
*/
#ifndef lint
static const char rcsid[] = "$OpenBSD: ypserv_db.c,v 1.25 2007/05/29 21:11:10 maja Exp $";
#endif
/*
* major revision/cleanup of Mats' version
* done by Chuck Cranor <chuck@ccrc.wustl.edu>
* Jan 1996.
*/
#include <rpc/rpc.h>
#include <rpcsvc/yp.h>
#include <rpcsvc/ypclnt.h>
#include <sys/stat.h>
#include <sys/param.h>
#include <fcntl.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <netdb.h>
#include <arpa/nameser.h>
#include <resolv.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/queue.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <syslog.h>
#include <errno.h>
#include "yplog.h"
#include "ypdb.h"
#include "ypdef.h"
#include "ypserv.h"
LIST_HEAD(domainlist, opt_domain); /* LIST of domains */
LIST_HEAD(maplist, opt_map); /* LIST of maps (in a domain) */
CIRCLEQ_HEAD(mapq, opt_map); /* CIRCLEQ of maps (LRU) */
struct opt_map {
mapname map; /* map name (malloc'd) */
DBM *db; /* database */
struct opt_domain *dom; /* back ptr to our domain */
int host_lookup; /* host lookup */
int secure; /* secure map? */
CIRCLEQ_ENTRY(opt_map) mapsq; /* map queue pointers */
LIST_ENTRY(opt_map) mapsl; /* map list pointers */
};
struct opt_domain {
domainname domain; /* domain name (malloc'd) */
struct maplist dmaps; /* the domain's active maps */
LIST_ENTRY(opt_domain) domsl; /* global linked list of domains */
};
struct domainlist doms; /* global list of domains */
struct mapq maps; /* global queue of maps (LRU) */
extern int usedns;
/*
* ypdb_init: init the queues and lists
*/
void
ypdb_init(void)
{
LIST_INIT(&doms);
CIRCLEQ_INIT(&maps);
}
/*
* yp_private:
* Check if key is a YP private key. Return TRUE if it is and
* ypprivate is FALSE.
*/
static int
yp_private(datum key, int ypprivate)
{
if (ypprivate)
return (FALSE);
if (key.dsize == 0 || key.dptr == NULL)
return (FALSE);
if (key.dsize == YP_LAST_LEN &&
strncmp(key.dptr, YP_LAST_KEY, YP_LAST_LEN) == 0)
return(TRUE);
if (key.dsize == YP_INPUT_LEN &&
strncmp(key.dptr, YP_INPUT_KEY, YP_INPUT_LEN) == 0)
return(TRUE);
if (key.dsize == YP_OUTPUT_LEN &&
strncmp(key.dptr, YP_OUTPUT_KEY, YP_OUTPUT_LEN) == 0)
return(TRUE);
if (key.dsize == YP_MASTER_LEN &&
strncmp(key.dptr, YP_MASTER_KEY, YP_MASTER_LEN) == 0)
return(TRUE);
if (key.dsize == YP_DOMAIN_LEN &&
strncmp(key.dptr, YP_DOMAIN_KEY, YP_DOMAIN_LEN) == 0)
return(TRUE);
if (key.dsize == YP_INTERDOMAIN_LEN &&
strncmp(key.dptr, YP_INTERDOMAIN_KEY, YP_INTERDOMAIN_LEN) == 0)
return(TRUE);
if (key.dsize == YP_SECURE_LEN &&
strncmp(key.dptr, YP_SECURE_KEY, YP_SECURE_LEN) == 0)
return(TRUE);
return(FALSE);
}
/*
* Close least recent used map. This routine is called when we have
* no more file descripotors free, or we want to close all maps.
*/
static void
ypdb_close_last(void)
{
struct opt_map *last = CIRCLEQ_LAST(&maps);
if (last == (void *)&maps) {
yplog(" ypdb_close_last: LRU list is empty!");
return;
}
CIRCLEQ_REMOVE(&maps, last, mapsq); /* remove from LRU circleq */
LIST_REMOVE(last, mapsl); /* remove from domain list */
#ifdef DEBUG
yplog(" ypdb_close_last: closing map %s in domain %s [db=0x%x]",
last->map, last->dom->domain, last->db);
#endif
ypdb_close(last->db); /* close DB */
free(last->map); /* free map name */
free(last); /* free map */
}
/*
* Close all open maps.
*/
void
ypdb_close_all(void)
{
#ifdef DEBUG
yplog(" ypdb_close_all(): start");
#endif
while (!CIRCLEQ_EMPTY(&maps))
ypdb_close_last();
#ifdef DEBUG
yplog(" ypdb_close_all(): done");
#endif
}
/*
* Close Database if Open/Close Optimization isn't turned on.
*/
static void
ypdb_close_db(DBM *db)
{
#ifdef DEBUG
yplog(" ypdb_close_db(0x%x)", db);
#endif
#ifndef OPTDB
ypdb_close_all();
#endif
}
/*
* ypdb_open_db
*/
DBM *
ypdb_open_db(domainname domain, mapname map, ypstat *status,
struct opt_map **map_info)
{
char map_path[MAXPATHLEN];
static char *domain_key = YP_INTERDOMAIN_KEY;
static char *secure_key = YP_SECURE_KEY;
DBM *db;
struct opt_domain *d = NULL;
struct opt_map *m = NULL;
datum k, v;
#ifdef OPTDB
int i;
#endif
/*
* check for preloaded domain, map
*/
LIST_FOREACH(d, &doms, domsl) {
if (strcmp(domain, d->domain) == 0)
break;
}
if (d) {
LIST_FOREACH(m, &d->dmaps, mapsl)
if (strcmp(map, m->map) == 0)
break;
}
/*
* map found open?
*/
if (m) {
#ifdef DEBUG
yplog(" ypdb_open_db: cached open: domain=%s, map=%s, db=0x%x",
domain, map, m->db);
#endif
CIRCLEQ_REMOVE(&maps, m, mapsq); /* adjust LRU queue */
CIRCLEQ_INSERT_HEAD(&maps, m, mapsq);
*status = YP_TRUE;
if (map_info)
*map_info = m;
return(m->db);
}
/* Check for illegal charcaters */
if (strchr(domain, '/')) {
*status = YP_NODOM;
return (NULL);
}
if (strchr(map, '/')) {
*status = YP_NOMAP;
return (NULL);
}
/*
* open map
*/
#ifdef OPTDB
i = 0;
while (i == 0) {
#endif
snprintf(map_path, sizeof(map_path), "%s/%s/%s", YP_DB_PATH,
domain, map);
db = ypdb_open(map_path, O_RDONLY, 0444);
#ifdef OPTDB
if (db == NULL) {
#ifdef DEBUG
yplog(" ypdb_open_db: errno %d (%s)",
errno, sys_errlist[errno]);
#endif
if (errno == ENFILE || errno == EMFILE) {
ypdb_close_last();
} else {
i = errno;
}
} else {
i = 4711;
}
}
#endif
*status = YP_NOMAP; /* see note below */
if (db == NULL) {
if (errno == ENOENT) {
#ifdef DEBUG
yplog(" ypdb_open_db: no map %s (domain=%s)",
map, domain);
#endif
return(NULL);
}
#ifdef DEBUG
yplog(" ypdb_open_db: ypdb_open FAILED: map %s (domain=%s)",
map, domain);
#endif
return(NULL);
}
/*
* note: status now YP_NOMAP
*/
if (d == NULL) { /* allocate new domain? */
d = malloc(sizeof(*d));
if (d)
d->domain = strdup(domain);
if (d == NULL || d->domain == NULL) {
yplog(" ypdb_open_db: MALLOC failed");
ypdb_close(db);
if (d)
free(d);
return(NULL);
}
LIST_INIT(&d->dmaps);
LIST_INSERT_HEAD(&doms, d, domsl);
#ifdef DEBUG
yplog(" ypdb_open_db: NEW DOMAIN %s", domain);
#endif
}
/*
* m must be NULL since we couldn't find a map. allocate new one
*/
m = malloc(sizeof(*m));
if (m)
m->map = strdup(map);
if (m == NULL || m->map == NULL) {
if (m)
free(m);
yplog(" ypdb_open_db: MALLOC failed");
ypdb_close(db);
return(NULL);
}
m->db = db;
m->dom = d;
m->host_lookup = FALSE;
CIRCLEQ_INSERT_HEAD(&maps, m, mapsq);
LIST_INSERT_HEAD(&d->dmaps, m, mapsl);
if (strcmp(map, YP_HOSTNAME) == 0 || strcmp(map, YP_HOSTADDR) == 0) {
if (!usedns) {
k.dptr = domain_key;
k.dsize = YP_INTERDOMAIN_LEN;
v = ypdb_fetch(db, k);
if (v.dptr)
m->host_lookup = TRUE;
} else
m->host_lookup = TRUE;
}
m->secure = FALSE;
k.dptr = secure_key;
k.dsize = YP_SECURE_LEN;
v = ypdb_fetch(db, k);
if (v.dptr)
m->secure = TRUE;
*status = YP_TRUE;
if (map_info)
*map_info = m;
#ifdef DEBUG
yplog(" ypdb_open_db: NEW MAP domain=%s, map=%s, hl=%d, s=%d, db=0x%x",
domain, map, m->host_lookup, m->secure, m->db);
#endif
return(m->db);
}
/*
* lookup host
*/
static ypstat
lookup_host(int nametable, int host_lookup, DBM *db, char *keystr,
ypresp_val *result)
{
struct hostent *host;
struct in_addr *addr_name;
struct in_addr addr_addr;
static char val[BUFSIZ+1]; /* match libc */
static char hostname[MAXHOSTNAMELEN];
char tmpbuf[MAXHOSTNAMELEN + 20], *v, *ptr;
int l;
if (!host_lookup)
return(YP_NOKEY);
if ((_res.options & RES_INIT) == 0)
res_init();
bcopy("b", _res.lookups, sizeof("b"));
if (nametable) {
host = gethostbyname(keystr);
if (host == NULL || host->h_addrtype != AF_INET)
return(YP_NOKEY);
addr_name = (struct in_addr *) *host->h_addr_list;
v = val;
for (; host->h_addr_list[0] != NULL; host->h_addr_list++) {
addr_name = (struct in_addr *)host->h_addr_list[0];
snprintf(tmpbuf, sizeof(tmpbuf), "%s %s\n",
inet_ntoa(*addr_name), host->h_name);
if (v - val + strlen(tmpbuf) + 1 > sizeof(val))
break;
strlcpy(v, tmpbuf, sizeof(val)); /* v == val */
v = v + strlen(tmpbuf);
}
result->val.valdat_val = val;
result->val.valdat_len = v - val;
return(YP_TRUE);
}
inet_aton(keystr, &addr_addr);
host = gethostbyaddr((char *)&addr_addr, sizeof(addr_addr), AF_INET);
if (host == NULL) return(YP_NOKEY);
strncpy((char *)hostname, host->h_name, sizeof(hostname) - 1);
hostname[sizeof(hostname) - 1] = '\0';
host = gethostbyname((char *)hostname);
if (host == NULL)
return(YP_NOKEY);
l = 0;
for (; host->h_addr_list[0] != NULL; host->h_addr_list++)
if (!bcmp(host->h_addr_list[0], &addr_addr, sizeof(addr_addr)))
l++;
if (l == 0) {
yplog("lookup_host: address %s not listed for host %s\n",
inet_ntoa(addr_addr), hostname);
syslog(LOG_NOTICE,
"ypserv: address %s not listed for host %s\n",
inet_ntoa(addr_addr), hostname);
return(YP_NOKEY);
}
snprintf(val, sizeof(val), "%s %s", keystr, host->h_name);
while ((ptr = *(host->h_aliases)) != NULL) {
strlcat(val, " ", sizeof(val));
if (strlcat(val, ptr, sizeof(val)) > sizeof(val))
break;
host->h_aliases++;
}
result->val.valdat_val = val;
result->val.valdat_len = v - val;
return(YP_TRUE);
}
ypresp_val
ypdb_get_record(domainname domain, mapname map, keydat key, int ypprivate)
{
static ypresp_val res;
static char keystr[YPMAXRECORD+1];
DBM *db;
datum k, v;
int host_lookup = 0, hn;
struct opt_map *map_info = NULL;
bzero(&res, sizeof(res));
db = ypdb_open_db(domain, map, &res.stat, &map_info);
if (!db || res.stat < 0)
return(res);
if (map_info)
host_lookup = map_info->host_lookup;
k.dptr = key.keydat_val;
k.dsize = key.keydat_len;
if (yp_private(k, ypprivate)) {
res.stat = YP_NOKEY;
goto done;
}
v = ypdb_fetch(db, k);
if (v.dptr == NULL) {
res.stat = YP_NOKEY;
if ((hn = strcmp(map, YP_HOSTNAME)) != 0 &&
strcmp(map, YP_HOSTADDR) != 0)
goto done;
/* note: lookup_host needs null terminated string */
strncpy(keystr, key.keydat_val, key.keydat_len);
keystr[key.keydat_len] = '\0';
res.stat = lookup_host((hn == 0) ? TRUE : FALSE,
host_lookup, db, keystr, &res);
} else {
res.val.valdat_val = v.dptr;
res.val.valdat_len = v.dsize;
}
done:
ypdb_close_db(db);
return(res);
}
ypresp_key_val
ypdb_get_first(domainname domain, mapname map, int ypprivate)
{
static ypresp_key_val res;
DBM *db;
datum k, v;
bzero(&res, sizeof(res));
db = ypdb_open_db(domain, map, &res.stat, NULL);
if (res.stat >= 0) {
k = ypdb_firstkey(db);
while (yp_private(k, ypprivate))
k = ypdb_nextkey(db);
if (k.dptr == NULL) {
res.stat = YP_NOKEY;
} else {
res.key.keydat_val = k.dptr;
res.key.keydat_len = k.dsize;
v = ypdb_fetch(db, k);
if (v.dptr == NULL) {
res.stat = YP_NOKEY;
} else {
res.val.valdat_val = v.dptr;
res.val.valdat_len = v.dsize;
}
}
}
ypdb_close_db(db);
return (res);
}
ypresp_key_val
ypdb_get_next(domainname domain, mapname map, keydat key, int ypprivate)
{
static ypresp_key_val res;
DBM *db;
datum k, v, n;
bzero(&res, sizeof(res));
db = ypdb_open_db(domain, map, &res.stat, NULL);
if (res.stat >= 0) {
n.dptr = key.keydat_val;
n.dsize = key.keydat_len;
v.dptr = NULL;
v.dsize = 0;
k.dptr = NULL;
k.dsize = 0;
n = ypdb_setkey(db, n);
if (n.dptr != NULL)
k = ypdb_nextkey(db);
else
k.dptr = NULL;
if (k.dptr != NULL) {
while (yp_private(k, ypprivate))
k = ypdb_nextkey(db);
}
if (k.dptr == NULL) {
res.stat = YP_NOMORE;
} else {
res.key.keydat_val = k.dptr;
res.key.keydat_len = k.dsize;
v = ypdb_fetch(db, k);
if (v.dptr == NULL) {
res.stat = YP_NOMORE;
} else {
res.val.valdat_val = v.dptr;
res.val.valdat_len = v.dsize;
}
}
}
ypdb_close_db(db);
return (res);
}
ypresp_order
ypdb_get_order(domainname domain, mapname map)
{
static ypresp_order res;
static char *order_key = YP_LAST_KEY;
char order[MAX_LAST_LEN+1];
DBM *db;
datum k, v;
bzero(&res, sizeof(res));
db = ypdb_open_db(domain, map, &res.stat, NULL);
if (res.stat >= 0) {
k.dptr = order_key;
k.dsize = YP_LAST_LEN;
v = ypdb_fetch(db, k);
if (v.dptr == NULL) {
res.stat = YP_NOKEY;
} else {
strncpy(order, v.dptr, v.dsize);
order[v.dsize] = '\0';
res.ordernum = (u_int32_t)atol(order);
}
}
ypdb_close_db(db);
return (res);
}
ypresp_master
ypdb_get_master(domainname domain, mapname map)
{
static ypresp_master res;
static char *master_key = YP_MASTER_KEY;
static char master[MAX_MASTER_LEN+1];
DBM *db;
datum k, v;
bzero(&res, sizeof(res));
db = ypdb_open_db(domain, map, &res.stat, NULL);
if (res.stat >= 0) {
k.dptr = master_key;
k.dsize = YP_MASTER_LEN;
v = ypdb_fetch(db, k);
if (v.dptr == NULL) {
res.stat = YP_NOKEY;
} else {
strncpy(master, v.dptr, v.dsize);
master[v.dsize] = '\0';
res.peer = (peername) &master;
}
}
ypdb_close_db(db);
return (res);
}
bool_t
ypdb_xdr_get_all(XDR *xdrs, ypreq_nokey *req)
{
static ypresp_all resp;
DBM *db;
datum k, v;
bzero(&resp, sizeof(resp));
/*
* open db, and advance past any private keys we may see
*/
db = ypdb_open_db(req->domain, req->map,
&resp.ypresp_all_u.val.stat, NULL);
if (!db || resp.ypresp_all_u.val.stat < 0)
return(FALSE);
k = ypdb_firstkey(db);
while (yp_private(k, FALSE))
k = ypdb_nextkey(db);
while (1) {
if (k.dptr == NULL)
break;
v = ypdb_fetch(db, k);
if (v.dptr == NULL)
break;
resp.more = TRUE;
resp.ypresp_all_u.val.stat = YP_TRUE;
resp.ypresp_all_u.val.key.keydat_val = k.dptr;
resp.ypresp_all_u.val.key.keydat_len = k.dsize;
resp.ypresp_all_u.val.val.valdat_val = v.dptr;
resp.ypresp_all_u.val.val.valdat_len = v.dsize;
if (!xdr_ypresp_all(xdrs, &resp)) {
#ifdef DEBUG
yplog(" ypdb_xdr_get_all: xdr_ypresp_all failed");
#endif
return(FALSE);
}
/* advance past private keys */
k = ypdb_nextkey(db);
while (yp_private(k, FALSE))
k = ypdb_nextkey(db);
}
bzero(&resp, sizeof(resp));
resp.ypresp_all_u.val.stat = YP_NOKEY;
resp.more = FALSE;
if (!xdr_ypresp_all(xdrs, &resp)) {
#ifdef DEBUG
yplog(" ypdb_xdr_get_all: final xdr_ypresp_all failed");
#endif
return(FALSE);
}
ypdb_close_db(db);
return (TRUE);
}
int
ypdb_secure(domainname domain, mapname map)
{
static ypresp_val res;
DBM *db;
int secure;
struct opt_map *map_info = NULL;
bzero(&res, sizeof(res));
secure = FALSE;
db = ypdb_open_db(domain, map, &res.stat, &map_info);
if (!db || res.stat < 0)
return(secure); /* ? */
if (map_info)
secure = map_info->secure;
ypdb_close_db(db);
return(secure);
}