Add support for rpc.ypxfrd and document it in the man page.
Also generallize the yp_dbwrite functions a little: allow the caller to specify certain flags. I need this mostly for some changes to rpc.yppasswdd to allow in-place updates. Also change Makefile a little to use the same format as ypserv.
This commit is contained in:
Bill Paul
parent
439a59dd6e
commit
16deb43a45
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=16132
@ -2,25 +2,39 @@
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PROG= ypxfr
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SRCS= ypxfr_clnt.c yp_clnt.c ypxfr_getmap.c yp_dblookup.c \
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yp_error.c ypxfr_misc.c ypxfr_main.c yp_dbwrite.c
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yp_error.c ypxfr_misc.c ypxfr_main.c yp_dbwrite.c \
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ypxfrd_xdr.c ypxfrd_getmap.c
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.PATH: ${.CURDIR}/../../usr.sbin/ypserv
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MAN8= ypxfr.8
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CFLAGS+=-I.
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CFLAGS+= -I.
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LDADD+= -lrpcsvc
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CLEANFILES= yp.h yp_clnt.c ypxfr_clnt.c
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RPCSRC= ${.DESTDIR}/usr/include/rpcsvc/yp.x
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RPCDIR= ${.CURDIR}/../../include/rpcsvc
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RPCGEN= rpcgen -I -C
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ypxfr_clnt.c: ${RPCSRC} yp.h
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${RPCGEN} -DYPPUSH_ONLY -l -o ${.TARGET} ${RPCSRC}
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ypxfr_clnt.c: ${RPCDIR}/yp.x yp.h
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rm -f ${.TARGET}
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${RPCGEN} -DYPPUSH_ONLY -l -o ${.TARGET} ${RPCDIR}/yp.x
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yp_clnt.c: ${RPCSRC} yp.h
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${RPCGEN} -DYPSERV_ONLY -l -o ${.TARGET} ${RPCSRC}
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yp_clnt.c: ${RPCDIR}/yp.x yp.h
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rm -f ${.TARGET}
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${RPCGEN} -DYPSERV_ONLY -l -o ${.TARGET} ${RPCDIR}/yp.x
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yp.h: ${RPCSRC}
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${RPCGEN} -h -o ${.TARGET} ${RPCSRC}
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yp.h: ${RPCDIR}/yp.x
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rm -f ${.TARGET}
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${RPCGEN} -h -o ${.TARGET} ${RPCDIR}/yp.x
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# ypxfrd_xdr.c: ${RPCDIR}/ypxfrd.x ypxfrd.h
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# rm -f ${.TARGET}
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# ${RPCGEN} -c -o ${.TARGET} ${RPCDIR}/ypxfrd.x
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ypxfrd.h: ${RPCDIR}/ypxfrd.x
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rm -f ${.TARGET}
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${RPCGEN} -h -o ${.TARGET} ${RPCDIR}/ypxfrd.x
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.include <bsd.prog.mk>
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@ -29,7 +29,7 @@
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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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* $Id: yp_dbwrite.c,v 1.9 1996/02/04 04:08:11 wpaul Exp wpaul $
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* $Id: yp_dbwrite.c,v 1.10 1996/06/03 03:11:25 wpaul Exp $
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*
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*/
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#include <stdio.h>
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@ -46,7 +46,7 @@
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#include "ypxfr_extern.h"
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#ifndef lint
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static const char rcsid[] = "$Id: yp_dbwrite.c,v 1.9 1996/02/04 04:08:11 wpaul Exp wpaul $";
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static const char rcsid[] = "$Id: yp_dbwrite.c,v 1.10 1996/06/03 03:11:25 wpaul Exp $";
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#endif
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#define PERM_SECURE (S_IRUSR|S_IWUSR)
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@ -54,9 +54,10 @@ static const char rcsid[] = "$Id: yp_dbwrite.c,v 1.9 1996/02/04 04:08:11 wpaul E
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/*
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* Open a DB database read/write
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*/
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DB *yp_open_db_rw(domain, map)
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DB *yp_open_db_rw(domain, map, flags)
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const char *domain;
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const char *map;
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const int flags;
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{
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DB *dbp;
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char buf[1025];
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@ -69,9 +70,10 @@ DB *yp_open_db_rw(domain, map)
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return (NULL);
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}
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snprintf(buf, sizeof(buf), "%s/%s/%s", yp_dir, domain, map);
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#define FLAGS O_RDWR|O_EXLOCK|O_EXCL|O_CREAT
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dbp = dbopen(buf,O_RDWR|O_EXLOCK|O_EXCL|O_CREAT, PERM_SECURE, DB_HASH, &openinfo);
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snprintf(buf, sizeof(buf), "%s/%s/%s", yp_dir, domain, map);
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dbp = dbopen(buf,flags ? flags : FLAGS,PERM_SECURE,DB_HASH,&openinfo);
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if (dbp == NULL) {
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switch(errno) {
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@ -90,14 +92,16 @@ DB *yp_open_db_rw(domain, map)
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return (dbp);
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}
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int yp_put_record(dbp,key,data)
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int yp_put_record(dbp,key,data,allow_overwrite)
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DB *dbp;
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DBT *key;
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DBT *data;
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int allow_overwrite;
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{
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int rval;
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if ((rval = (dbp->put)(dbp,key,data,R_NOOVERWRITE))) {
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if ((rval = (dbp->put)(dbp,key,data, allow_overwrite ? 0 :
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R_NOOVERWRITE))) {
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switch(rval) {
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case 1:
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return(YP_FALSE);
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@ -28,7 +28,7 @@
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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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.\" $Id: ypxfr.8,v 1.1.1.1 1995/12/25 03:07:13 wpaul Exp $
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.\" $Id: ypxfr.8,v 1.3 1996/06/05 04:07:04 wpaul Exp $
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.\"
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.Dd February 5, 1995
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.Dt YPXFR 8
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@ -122,6 +122,30 @@ is invoked without a controlling terminal, e.g. from inside
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it logs all its output using the
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.Xr syslog 3
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facility.
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.Sh NOTES
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The FreeBSD version of
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.Nm ypxfr
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has support for a special map transfer protocol which works in
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conjunction with the FreeBSD
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.Xr rpc.ypxfrd 8
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server. This protocol allows it to transfer raw map database files from
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the NIS master server and can be many times faster than the standard
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transfer method, particularly for very large NIS maps. The
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.Nm ypxfr
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command will check to see if the
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.Xr rpc.ypxfrd 8
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server is registered on the NIS master server and attempt to use
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it if it is present. If it isn't it will fall back to the standard
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transfer method, copying the map contents from
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.Xr ypserv 8
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and creating new maps instead.
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.Pp
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Note that while the FreeBSD ypxfrd protocol is conceptually similar
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to the SunOS ypxfrd protocol, FreeBSD's protocol is not compatible with
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Sun's, therefore it will not work with Sun's ypxfrd server. FreeBSD
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slave systems can still transfer maps from any non-FreeBSD NIS server,
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however they will only be able to take advantage of the faster protocol
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if the master server is also running FreeBSD.
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.Sh OPTIONS
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The following options and flags are supported by
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.Nm ypxfr :
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@ -29,12 +29,15 @@
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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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* $Id: ypxfr_extern.h,v 1.5 1995/12/24 04:37:22 wpaul Exp $
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* $Id: ypxfr_extern.h,v 1.7 1996/06/03 03:10:42 wpaul Exp $
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*/
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#include <sys/types.h>
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#include <limits.h>
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#include <db.h>
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#include <paths.h>
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#include <db.h>
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extern HASHINFO openinfo;
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extern BTREEINFO openinfo_b;
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#ifndef _PATH_YP
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#define _PATH_YP "/var/yp/"
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@ -42,16 +45,17 @@
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extern char *yp_dir;
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extern int debug;
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extern HASHINFO openinfo;
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extern int yp_errno;
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extern void yp_error __P(( const char *, ... ));
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extern int _yp_check __P(( char ** ));
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extern char *ypxfrerr_string __P(( ypxfrstat ));
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extern DB *yp_open_db_rw __P(( const char *, const char *));
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extern int yp_put_record __P(( DB *, DBT *, DBT * ));
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extern DB *yp_open_db_rw __P(( const char *, const char *, const int));
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extern void yp_init_dbs __P(( void ));
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extern int yp_put_record __P(( DB *, DBT *, DBT * , int ));
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extern int yp_get_record __P(( const char *, const char *, const DBT *, DBT *, int ));
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extern int ypxfr_get_map __P(( char *, char *, char *, int (*)() ));
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extern char *ypxfr_get_master __P(( char *, char *, char *, const int ));
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extern unsigned long ypxfr_get_order __P(( char *, char *, char *, const int ));
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extern char *ypxfxerr_string __P(( ypxfrstat ));
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extern int ypxfrd_get_map __P(( char *, char *, char *, char *));
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extern int callrpc __P(( char *, int, int, int, xdrproc_t, char *, xdrproc_t, char *));
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@ -29,7 +29,7 @@
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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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* $Id: ypxfr_getmap.c,v 1.7 1996/02/03 23:09:28 wpaul Exp $
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* $Id: ypxfr_getmap.c,v 1.8 1996/06/02 05:12:24 wpaul Exp $
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*/
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#include <stdio.h>
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#include <sys/types.h>
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@ -40,7 +40,7 @@
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#include "ypxfr_extern.h"
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#ifndef lint
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static const char rcsid[] = "$Id: ypxfr_getmap.c,v 1.7 1996/02/03 23:09:28 wpaul Exp $";
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static const char rcsid[] = "$Id: ypxfr_getmap.c,v 1.8 1996/06/02 05:12:24 wpaul Exp $";
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#endif
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extern bool_t xdr_ypresp_all_seq __P(( XDR *, unsigned long * ));
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@ -75,7 +75,8 @@ int ypxfr_get_map(map, domain, host, callback)
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/* YPPROC_ALL is a TCP service */
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if ((clnt = clnt_create(host, YPPROG, YPVERS, "tcp")) == NULL) {
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yp_error("%s", clnt_spcreateerror("failed to tcp handle"));
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yp_error("%s", clnt_spcreateerror("failed to \
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create tcp handle"));
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yp_errno = YPXFR_YPERR;
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return(1);
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}
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@ -29,7 +29,7 @@
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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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* $Id: ypxfr_main.c,v 1.15 1996/01/10 17:41:55 wpaul Exp $
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* $Id: ypxfr_main.c,v 1.17 1996/06/03 03:11:39 wpaul Exp $
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*/
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#include <stdio.h>
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#include <stdlib.h>
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@ -47,10 +47,11 @@
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#include <rpcsvc/yp.h>
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struct dom_binding {};
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#include <rpcsvc/ypclnt.h>
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#include <rpcsvc/ypxfrd.h>
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#include "ypxfr_extern.h"
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#ifndef lint
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static const char rcsid[] = "$Id: ypxfr_main.c,v 1.15 1996/01/10 17:41:55 wpaul Exp $";
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static const char rcsid[] = "$Id: ypxfr_main.c,v 1.17 1996/06/03 03:11:39 wpaul Exp $";
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#endif
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char *progname = "ypxfr";
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@ -86,7 +87,8 @@ static void ypxfr_exit(retval, temp)
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if ((clnt = clntudp_create(&ypxfr_callback_addr, ypxfr_prognum,
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1, timeout, &sock)) == NULL) {
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yp_error("%s", clnt_spcreateerror("failed to establish callback handle"));
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yp_error("%s", clnt_spcreateerror("failed to \
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establish callback handle"));
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exit(1);
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}
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@ -136,7 +138,7 @@ int ypxfr_foreach(status, key, keylen, val, vallen, data)
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dbval.data = val;
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dbval.size = vallen;
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if (yp_put_record(dbp, &dbkey, &dbval) != YP_TRUE)
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if (yp_put_record(dbp, &dbkey, &dbval, 0) != YP_TRUE)
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return(yp_errno);
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return (0);
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@ -374,8 +376,16 @@ the local domain name isn't set");
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snprintf(ypxfr_temp_map, sizeof(ypxfr_temp_map), "%s/%s/%s", yp_dir,
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ypxfr_dest_domain, tempmap);
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|
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if (getrpcport(ypxfr_master, YPXFRD_FREEBSD_PROG,
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YPXFRD_FREEBSD_VERS, IPPROTO_TCP)) {
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/* Try to send using ypxfrd. If it fails, use old method. */
|
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if (!ypxfrd_get_map(ypxfr_master, ypxfr_mapname,
|
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ypxfr_source_domain, ypxfr_temp_map))
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goto leave;
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}
|
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|
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/* Open the temporary map read/write. */
|
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if ((dbp = yp_open_db_rw(ypxfr_dest_domain, tempmap)) == NULL) {
|
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if ((dbp = yp_open_db_rw(ypxfr_dest_domain, tempmap, 0)) == NULL) {
|
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yp_error("failed to open temporary map file");
|
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ypxfr_exit(YPXFR_DBM,NULL);
|
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}
|
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@ -389,7 +399,7 @@ the local domain name isn't set");
|
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data.data = buf;
|
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data.size = strlen(buf);
|
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|
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if (yp_put_record(dbp, &key, &data) != YP_TRUE) {
|
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if (yp_put_record(dbp, &key, &data, 0) != YP_TRUE) {
|
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yp_error("failed to write order number to database");
|
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ypxfr_exit(YPXFR_DBM,&ypxfr_temp_map);
|
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}
|
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@ -399,7 +409,7 @@ the local domain name isn't set");
|
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data.data = ypxfr_master;
|
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data.size = strlen(ypxfr_master);
|
||||
|
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if (yp_put_record(dbp, &key, &data) != YP_TRUE) {
|
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if (yp_put_record(dbp, &key, &data, 0) != YP_TRUE) {
|
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yp_error("failed to write master name to database");
|
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ypxfr_exit(YPXFR_DBM,&ypxfr_temp_map);
|
||||
}
|
||||
@ -409,7 +419,7 @@ the local domain name isn't set");
|
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data.data = ypxfr_dest_domain;
|
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data.size = strlen(ypxfr_dest_domain);
|
||||
|
||||
if (yp_put_record(dbp, &key, &data) != YP_TRUE) {
|
||||
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);
|
||||
}
|
||||
@ -421,7 +431,7 @@ the local domain name isn't set");
|
||||
data.data = &buf;
|
||||
data.size = strlen(buf);
|
||||
|
||||
if (yp_put_record(dbp, &key, &data) != YP_TRUE) {
|
||||
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);
|
||||
|
||||
@ -435,7 +445,7 @@ the local domain name isn't set");
|
||||
data.data = &buf;
|
||||
data.size = strlen(buf);
|
||||
|
||||
if (yp_put_record(dbp, &key, &data) != YP_TRUE) {
|
||||
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);
|
||||
}
|
||||
@ -451,6 +461,11 @@ the local domain name isn't set");
|
||||
(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,
|
||||
@ -466,8 +481,6 @@ the local domain name isn't set");
|
||||
|
||||
/*
|
||||
* Send a YPPROC_CLEAR to the local ypserv.
|
||||
* The FreeBSD ypserv doesn't really need this, but we send it
|
||||
* here anyway for the sake of consistency.
|
||||
*/
|
||||
if (ypxfr_clear) {
|
||||
char in = 0;
|
||||
|
||||
@ -29,7 +29,7 @@
|
||||
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
||||
* SUCH DAMAGE.
|
||||
*
|
||||
* $Id: ypxfr_misc.c,v 1.2 1996/02/04 05:18:44 wpaul Exp $
|
||||
* $Id: ypxfr_misc.c,v 1.8 1996/06/02 05:12:00 wpaul Exp $
|
||||
*/
|
||||
#include <stdlib.h>
|
||||
#include <unistd.h>
|
||||
@ -41,7 +41,7 @@ struct dom_binding {};
|
||||
#include "ypxfr_extern.h"
|
||||
|
||||
#ifndef lint
|
||||
static const char rcsid[] = "$Id: ypxfr_misc.c,v 1.2 1996/02/04 05:18:44 wpaul Exp $";
|
||||
static const char rcsid[] = "$Id: ypxfr_misc.c,v 1.8 1996/06/02 05:12:00 wpaul Exp $";
|
||||
#endif
|
||||
|
||||
char *ypxfrerr_string(code)
|
||||
@ -188,7 +188,7 @@ failed"));
|
||||
return(NULL);
|
||||
}
|
||||
snprintf(mastername, sizeof(mastername), "%s", resp->peer);
|
||||
/* xdr_free(xdr_ypresp_master, (char *)&resp); */
|
||||
/* xdr_free(xdr_ypresp_master, (char *)&resp); */
|
||||
return((char *)&mastername);
|
||||
}
|
||||
}
|
||||
|
||||
130
libexec/ypxfr/ypxfrd_getmap.c
Normal file
130
libexec/ypxfr/ypxfrd_getmap.c
Normal file
@ -0,0 +1,130 @@
|
||||
/*
|
||||
* Copyright (c) 1995, 1996
|
||||
* 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.
|
||||
*
|
||||
* $Id: ypxfrd_getmap.c,v 1.7 1996/06/02 19:51:33 wpaul Exp $
|
||||
*/
|
||||
|
||||
#include <sys/types.h>
|
||||
#include <time.h>
|
||||
#include <rpcsvc/ypxfrd.h>
|
||||
#include <rpcsvc/yp.h>
|
||||
#include <rpc/rpc.h>
|
||||
#include <sys/uio.h>
|
||||
#include <sys/fcntl.h>
|
||||
#include <sys/stat.h>
|
||||
#include <errno.h>
|
||||
#include "ypxfr_extern.h"
|
||||
|
||||
#ifndef lint
|
||||
static const char rcsid[] = "$Id: ypxfrd_getmap.c,v 1.7 1996/06/02 19:51:33 wpaul Exp $";
|
||||
#endif
|
||||
|
||||
int fp = 0;
|
||||
|
||||
static bool_t xdr_my_xfr(register XDR *xdrs, xfr *objp)
|
||||
{
|
||||
while(1) {
|
||||
if (!xdr_xfr(xdrs, objp))
|
||||
return(FALSE);
|
||||
if (objp->ok == TRUE) {
|
||||
if (write(fp, objp->xfr_u.xfrblock_buf.xfrblock_buf_val,
|
||||
objp->xfr_u.xfrblock_buf.xfrblock_buf_len) == -1) {
|
||||
yp_error("write failed: %s", strerror(errno));
|
||||
return(FALSE);
|
||||
}
|
||||
}
|
||||
xdr_free(xdr_xfr, (char *)objp);
|
||||
if (objp->ok == FALSE) {
|
||||
switch(objp->xfr_u.xfrstat) {
|
||||
case(XFR_DONE):
|
||||
return(TRUE);
|
||||
break;
|
||||
case(XFR_READ_ERR):
|
||||
yp_error("got read error from rpc.ypxfrd");
|
||||
return(FALSE);
|
||||
break;
|
||||
case(XFR_ACCESS):
|
||||
yp_error("rpc.ypxfrd couldn't access the map");
|
||||
return(FALSE);
|
||||
break;
|
||||
case(XFR_DENIED):
|
||||
yp_error("access to map denied by rpc.ypxfrd");
|
||||
return(FALSE);
|
||||
break;
|
||||
default:
|
||||
yp_error("got unknown status from rpc.ypxfrd");
|
||||
return(FALSE);
|
||||
break;
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
#define PERM_SECURE (S_IRUSR|S_IWUSR)
|
||||
|
||||
int ypxfrd_get_map(host, map, domain, tmpname)
|
||||
char *host;
|
||||
char *map;
|
||||
char *domain;
|
||||
char *tmpname;
|
||||
{
|
||||
CLIENT *clnt;
|
||||
struct ypxfr_mapname req;
|
||||
struct xfr resp;
|
||||
struct timeval timeout = { 0, 25 };
|
||||
int status = 0;
|
||||
|
||||
req.xfrmap = map;
|
||||
req.xfrdomain = domain;
|
||||
bzero((char *)&resp, sizeof(resp));
|
||||
|
||||
if ((clnt = clnt_create(host, YPXFRD_FREEBSD_PROG,
|
||||
YPXFRD_FREEBSD_VERS, "tcp")) == NULL) {
|
||||
return(1);
|
||||
}
|
||||
|
||||
if ((fp = open(tmpname, O_RDWR|O_CREAT, PERM_SECURE)) == -1) {
|
||||
clnt_destroy(clnt);
|
||||
yp_error("couldn't open %s: %s", tmpname, strerror(errno));
|
||||
return(1);
|
||||
}
|
||||
|
||||
if (clnt_call(clnt,YPXFRD_GETMAP,xdr_ypxfr_mapname,(char *)&req,
|
||||
xdr_my_xfr, (char *)&resp, timeout) != RPC_SUCCESS) {
|
||||
yp_error("%s", clnt_sperror(clnt,"call to rpc.ypxfrd failed"));
|
||||
status++;
|
||||
unlink(tmpname);
|
||||
}
|
||||
|
||||
clnt_destroy(clnt);
|
||||
close(fp);
|
||||
return(status);
|
||||
}
|
||||
Loading…
Reference in New Issue
Block a user