FreeBSD-5.3/libexec/ypxfr/ypxfr_main.c
/*
* Copyright (c) 1995
* Bill Paul <wpaul@ctr.columbia.edu>. 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 Bill Paul.
* 4. Neither the name of the author nor the names of any co-contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY Bill Paul 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 Bill Paul 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.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: src/libexec/ypxfr/ypxfr_main.c,v 1.19 2003/10/26 04:32:53 peter Exp $");
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/param.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <rpc/rpc.h>
#include <rpc/clnt.h>
#include <rpcsvc/yp.h>
struct dom_binding {};
#include <rpcsvc/ypclnt.h>
#include <rpcsvc/ypxfrd.h>
#include "ypxfr_extern.h"
char *progname = "ypxfr";
char *yp_dir = _PATH_YP;
int _rpcpmstart = 0;
int ypxfr_use_yplib = 0; /* Assume the worst. */
int ypxfr_clear = 1;
int ypxfr_prognum = 0;
struct sockaddr_in ypxfr_callback_addr;
struct yppushresp_xfr ypxfr_resp;
DB *dbp;
static void
ypxfr_exit(ypxfrstat retval, char *temp)
{
CLIENT *clnt;
int sock = RPC_ANYSOCK;
struct timeval timeout;
/* Clean up no matter what happened previously. */
if (temp != NULL) {
if (dbp != NULL)
(void)(dbp->close)(dbp);
if (unlink(temp) == -1) {
yp_error("failed to unlink %s",strerror(errno));
}
}
if (ypxfr_prognum) {
timeout.tv_sec = 20;
timeout.tv_usec = 0;
if ((clnt = clntudp_create(&ypxfr_callback_addr, ypxfr_prognum,
1, timeout, &sock)) == NULL) {
yp_error("%s", clnt_spcreateerror("failed to "
"establish callback handle"));
exit(1);
}
ypxfr_resp.status = retval;
if (yppushproc_xfrresp_1(&ypxfr_resp, clnt) == NULL) {
yp_error("%s", clnt_sperror(clnt, "callback failed"));
clnt_destroy(clnt);
exit(1);
}
clnt_destroy(clnt);
} else {
yp_error("Exiting: %s", ypxfrerr_string(retval));
}
exit(0);
}
static void
usage(void)
{
if (_rpcpmstart) {
ypxfr_exit(YPXFR_BADARGS,NULL);
} else {
fprintf(stderr, "%s\n%s\n%s\n",
"usage: ypxfr [-f] [-c] [-d target domain] [-h source host]",
" [-s source domain] [-p path]",
" [-C taskid program-number ipaddr port] mapname");
exit(1);
}
}
int
ypxfr_foreach(int status, char *key, int keylen, char *val, int vallen,
char *data)
{
DBT dbkey, dbval;
if (status != YP_TRUE)
return (status);
/*
* XXX Do not attempt to write zero-length keys or
* data into a Berkeley DB hash database. It causes a
* strange failure mode where sequential searches get
* caught in an infinite loop.
*/
if (keylen) {
dbkey.data = key;
dbkey.size = keylen;
} else {
dbkey.data = "";
dbkey.size = 1;
}
if (vallen) {
dbval.data = val;
dbval.size = vallen;
} else {
dbval.data = "";
dbval.size = 1;
}
if (yp_put_record(dbp, &dbkey, &dbval, 0) != YP_TRUE)
return(yp_errno);
return (0);
}
int
main(int argc, char *argv[])
{
int ch;
int ypxfr_force = 0;
char *ypxfr_dest_domain = NULL;
char *ypxfr_source_host = NULL;
char *ypxfr_source_domain = NULL;
char *ypxfr_local_domain = NULL;
char *ypxfr_master = NULL;
unsigned long ypxfr_order = -1, ypxfr_skew_check = -1;
char *ypxfr_mapname = NULL;
int ypxfr_args = 0;
char ypxfr_temp_map[MAXPATHLEN + 2];
char tempmap[MAXPATHLEN + 2];
char buf[MAXPATHLEN + 2];
DBT key, data;
int remoteport;
int interdom = 0;
int secure = 0;
debug = 1;
if (!isatty(fileno(stderr))) {
openlog("ypxfr", LOG_PID, LOG_DAEMON);
_rpcpmstart = 1;
}
if (argc < 2)
usage();
while ((ch = getopt(argc, argv, "fcd:h:s:p:C:")) != -1) {
int my_optind;
switch (ch) {
case 'f':
ypxfr_force++;
ypxfr_args++;
break;
case 'c':
ypxfr_clear = 0;
ypxfr_args++;
break;
case 'd':
ypxfr_dest_domain = optarg;
ypxfr_args += 2;
break;
case 'h':
ypxfr_source_host = optarg;
ypxfr_args += 2;
break;
case 's':
ypxfr_source_domain = optarg;
ypxfr_args += 2;
break;
case 'p':
yp_dir = optarg;
ypxfr_args += 2;
break;
case 'C':
/*
* Whoever decided that the -C flag should take
* four arguments is a twit.
*/
my_optind = optind - 1;
if (argv[my_optind] == NULL || !strlen(argv[my_optind])) {
yp_error("transaction ID not specified");
usage();
}
ypxfr_resp.transid = atol(argv[my_optind]);
my_optind++;
if (argv[my_optind] == NULL || !strlen(argv[my_optind])) {
yp_error("RPC program number not specified");
usage();
}
ypxfr_prognum = atol(argv[my_optind]);
my_optind++;
if (argv[my_optind] == NULL || !strlen(argv[my_optind])) {
yp_error("address not specified");
usage();
}
if (!inet_aton(argv[my_optind], &ypxfr_callback_addr.sin_addr)) {
yp_error("failed to convert '%s' to IP addr",
argv[my_optind]);
exit(1);
}
my_optind++;
if (argv[my_optind] == NULL || !strlen(argv[my_optind])) {
yp_error("port not specified");
usage();
}
ypxfr_callback_addr.sin_port = htons((u_short)atoi(argv[my_optind]));
ypxfr_args += 5;
break;
default:
usage();
break;
}
}
ypxfr_mapname = argv[ypxfr_args + 1];
if (ypxfr_mapname == NULL) {
yp_error("no map name specified");
usage();
}
/* Always the case. */
ypxfr_callback_addr.sin_family = AF_INET;
/* Determine if local NIS client facilities are turned on. */
if (!yp_get_default_domain(&ypxfr_local_domain) &&
_yp_check(&ypxfr_local_domain))
ypxfr_use_yplib = 1;
/*
* If no destination domain is specified, assume that the
* local default domain is to be used and try to obtain it.
* Fails if NIS client facilities are turned off.
*/
if (ypxfr_dest_domain == NULL) {
if (ypxfr_use_yplib) {
yp_get_default_domain(&ypxfr_dest_domain);
} else {
yp_error("no destination domain specified and \
the local domain name isn't set");
ypxfr_exit(YPXFR_BADARGS,NULL);
}
}
/*
* If a source domain is not specified, assume it to
* be the same as the destination domain.
*/
if (ypxfr_source_domain == NULL) {
ypxfr_source_domain = ypxfr_dest_domain;
}
/*
* If the source host is not specified, assume it to be the
* master for the specified map. If local NIS client facilities
* are turned on, we can figure this out using yp_master().
* If not, we have to see if a local copy of the map exists
* and extract its YP_MASTER_NAME record. If _that_ fails,
* we are stuck and must ask the user for more information.
*/
if (ypxfr_source_host == NULL) {
if (!ypxfr_use_yplib) {
/*
* Double whammy: NIS isn't turned on and the user
* didn't specify a source host.
*/
char *dptr;
key.data = "YP_MASTER_NAME";
key.size = sizeof("YP_MASTER_NAME") - 1;
if (yp_get_record(ypxfr_dest_domain, ypxfr_mapname,
&key, &data, 1) != YP_TRUE) {
yp_error("no source host specified");
ypxfr_exit(YPXFR_BADARGS,NULL);
}
dptr = data.data;
dptr[data.size] = '\0';
ypxfr_master = ypxfr_source_host = strdup(dptr);
}
} else {
if (ypxfr_use_yplib)
ypxfr_use_yplib = 0;
}
if (ypxfr_master == NULL) {
if ((ypxfr_master = ypxfr_get_master(ypxfr_source_domain,
ypxfr_mapname,
ypxfr_source_host,
ypxfr_use_yplib)) == NULL) {
yp_error("failed to find master of %s in domain %s: %s",
ypxfr_mapname, ypxfr_source_domain,
ypxfrerr_string(yp_errno));
ypxfr_exit(YPXFR_MADDR,NULL);
}
}
/*
* If we got here and ypxfr_source_host is still undefined,
* it means we had to resort to using yp_master() to find the
* master server for the map. The source host and master should
* be identical.
*/
if (ypxfr_source_host == NULL)
ypxfr_source_host = ypxfr_master;
/*
* Don't talk to ypservs on unprivileged ports.
*/
remoteport = getrpcport(ypxfr_source_host, YPPROG, YPVERS, IPPROTO_UDP);
if (remoteport >= IPPORT_RESERVED) {
yp_error("ypserv on %s not running on reserved port",
ypxfr_source_host);
ypxfr_exit(YPXFR_REFUSED, NULL);
}
if ((ypxfr_order = ypxfr_get_order(ypxfr_source_domain,
ypxfr_mapname,
ypxfr_master, 0)) == 0) {
yp_error("failed to get order number of %s: %s",
ypxfr_mapname, yp_errno == YPXFR_SUCC ?
"map has order 0" : ypxfrerr_string(yp_errno));
ypxfr_exit(YPXFR_YPERR,NULL);
}
if (ypxfr_match(ypxfr_master, ypxfr_source_domain, ypxfr_mapname,
"YP_INTERDOMAIN", sizeof("YP_INTERDOMAIN") - 1))
interdom++;
if (ypxfr_match(ypxfr_master, ypxfr_source_domain, ypxfr_mapname,
"YP_SECURE", sizeof("YP_SECURE") - 1))
secure++;
key.data = "YP_LAST_MODIFIED";
key.size = sizeof("YP_LAST_MODIFIED") - 1;
/* The order number is immaterial when the 'force' flag is set. */
if (!ypxfr_force) {
int ignore = 0;
if (yp_get_record(ypxfr_dest_domain,ypxfr_mapname,&key,&data,1) != YP_TRUE) {
switch (yp_errno) {
case YP_NOKEY:
ypxfr_exit(YPXFR_FORCE,NULL);
break;
case YP_NOMAP:
/*
* If the map doesn't exist, we're
* creating it. Ignore the error.
*/
ignore++;
break;
case YP_BADDB:
default:
ypxfr_exit(YPXFR_DBM,NULL);
break;
}
}
if (!ignore && ypxfr_order <= atoi(data.data))
ypxfr_exit(YPXFR_AGE, NULL);
}
/* Construct a temporary map file name */
snprintf(tempmap, sizeof(tempmap), "%s.%d",ypxfr_mapname, getpid());
snprintf(ypxfr_temp_map, sizeof(ypxfr_temp_map), "%s/%s/%s", yp_dir,
ypxfr_dest_domain, tempmap);
if ((remoteport = getrpcport(ypxfr_source_host, YPXFRD_FREEBSD_PROG,
YPXFRD_FREEBSD_VERS, IPPROTO_TCP))) {
/* Don't talk to rpc.ypxfrds on unprovileged ports. */
if (remoteport >= IPPORT_RESERVED) {
yp_error("rpc.ypxfrd on %s not using privileged port",
ypxfr_source_host);
ypxfr_exit(YPXFR_REFUSED, NULL);
}
/* Try to send using ypxfrd. If it fails, use old method. */
if (!ypxfrd_get_map(ypxfr_source_host, ypxfr_mapname,
ypxfr_source_domain, ypxfr_temp_map))
goto leave;
}
/* Open the temporary map read/write. */
if ((dbp = yp_open_db_rw(ypxfr_dest_domain, tempmap, 0)) == NULL) {
yp_error("failed to open temporary map file");
ypxfr_exit(YPXFR_DBM,NULL);
}
/*
* Fill in the keys we already know, such as the order number,
* master name, input file name (we actually make up a bogus
* name for that) and output file name.
*/
snprintf(buf, sizeof(buf), "%lu", ypxfr_order);
data.data = buf;
data.size = strlen(buf);
if (yp_put_record(dbp, &key, &data, 0) != YP_TRUE) {
yp_error("failed to write order number to database");
ypxfr_exit(YPXFR_DBM,ypxfr_temp_map);
}
key.data = "YP_MASTER_NAME";
key.size = sizeof("YP_MASTER_NAME") - 1;
data.data = ypxfr_master;
data.size = strlen(ypxfr_master);
if (yp_put_record(dbp, &key, &data, 0) != YP_TRUE) {
yp_error("failed to write master name to database");
ypxfr_exit(YPXFR_DBM,ypxfr_temp_map);
}
key.data = "YP_DOMAIN_NAME";
key.size = sizeof("YP_DOMAIN_NAME") - 1;
data.data = ypxfr_dest_domain;
data.size = strlen(ypxfr_dest_domain);
if (yp_put_record(dbp, &key, &data, 0) != YP_TRUE) {
yp_error("failed to write domain name to database");
ypxfr_exit(YPXFR_DBM,ypxfr_temp_map);
}
snprintf (buf, sizeof(buf), "%s:%s", ypxfr_source_host, ypxfr_mapname);
key.data = "YP_INPUT_NAME";
key.size = sizeof("YP_INPUT_NAME") - 1;
data.data = &buf;
data.size = strlen(buf);
if (yp_put_record(dbp, &key, &data, 0) != YP_TRUE) {
yp_error("failed to write input name to database");
ypxfr_exit(YPXFR_DBM,ypxfr_temp_map);
}
snprintf(buf, sizeof(buf), "%s/%s/%s", yp_dir, ypxfr_dest_domain,
ypxfr_mapname);
key.data = "YP_OUTPUT_NAME";
key.size = sizeof("YP_OUTPUT_NAME") - 1;
data.data = &buf;
data.size = strlen(buf);
if (yp_put_record(dbp, &key, &data, 0) != YP_TRUE) {
yp_error("failed to write output name to database");
ypxfr_exit(YPXFR_DBM,ypxfr_temp_map);
}
if (interdom) {
key.data = "YP_INTERDOMAIN";
key.size = sizeof("YP_INTERDOMAIN") - 1;
data.data = "";
data.size = 0;
if (yp_put_record(dbp, &key, &data, 0) != YP_TRUE) {
yp_error("failed to add interdomain flag to database");
ypxfr_exit(YPXFR_DBM,ypxfr_temp_map);
}
}
if (secure) {
key.data = "YP_SECURE";
key.size = sizeof("YP_SECURE") - 1;
data.data = "";
data.size = 0;
if (yp_put_record(dbp, &key, &data, 0) != YP_TRUE) {
yp_error("failed to add secure flag to database");
ypxfr_exit(YPXFR_DBM,ypxfr_temp_map);
}
}
/* Now suck over the contents of the map from the master. */
if (ypxfr_get_map(ypxfr_mapname,ypxfr_source_domain,
ypxfr_source_host, ypxfr_foreach)){
yp_error("failed to retrieve map from source host");
ypxfr_exit(YPXFR_YPERR,ypxfr_temp_map);
}
(void)(dbp->close)(dbp);
dbp = NULL; /* <- yes, it seems this is necessary. */
leave:
snprintf(buf, sizeof(buf), "%s/%s/%s", yp_dir, ypxfr_dest_domain,
ypxfr_mapname);
/* Peek at the order number again and check for skew. */
if ((ypxfr_skew_check = ypxfr_get_order(ypxfr_source_domain,
ypxfr_mapname,
ypxfr_master, 0)) == 0) {
yp_error("failed to get order number of %s: %s",
ypxfr_mapname, yp_errno == YPXFR_SUCC ?
"map has order 0" : ypxfrerr_string(yp_errno));
ypxfr_exit(YPXFR_YPERR,ypxfr_temp_map);
}
if (ypxfr_order != ypxfr_skew_check)
ypxfr_exit(YPXFR_SKEW,ypxfr_temp_map);
/*
* Send a YPPROC_CLEAR to the local ypserv.
*/
if (ypxfr_clear) {
char in = 0;
char *out = NULL;
int stat;
if ((stat = callrpc("localhost",YPPROG,YPVERS,YPPROC_CLEAR,
(xdrproc_t)xdr_void, (void *)&in,
(xdrproc_t)xdr_void, (void *)out)) != RPC_SUCCESS) {
yp_error("failed to send 'clear' to local ypserv: %s",
clnt_sperrno((enum clnt_stat) stat));
ypxfr_exit(YPXFR_CLEAR, ypxfr_temp_map);
}
}
/*
* Put the new map in place immediately. I'm not sure if the
* kernel does an unlink() and rename() atomically in the event
* that we move a new copy of a map over the top of an existing
* one, but there's less chance of a race condition happening
* than if we were to do the unlink() ourselves.
*/
if (rename(ypxfr_temp_map, buf) == -1) {
yp_error("rename(%s,%s) failed: %s", ypxfr_temp_map, buf,
strerror(errno));
ypxfr_exit(YPXFR_FILE,NULL);
}
ypxfr_exit(YPXFR_SUCC,NULL);
return(1);
}