Fix a couple of bogons. The first two were brought to my attention

by Peter Wemm:

- In yppasswdproc_update_1_svc(), I wasn't paying attention and put
  a couple of lines of code _after_ a return() instead of before.
  (*blush*)

- The removal of certain temp files didn't always work (this showed
  up mostly if you were using /etc/master.passwd as your NIS passwd
  template instead of /var/yp/master.passwd). This is because the
  whole temp file creation mechanism I was using was tragically
  broken (you can't rename across filesystems).

This problem I found myself:

- If you have a very large password database (30,000 or more entries),
  there can be a delay of several seconds while pw_copy() copies the
  ASCII template file and subsitutes in the modified/new entry. During
  this time, the clnt_udp() code in the RPC library may get impatient
  and retry its request. This will get queued at the server and be
  treated as a second request. By then the password change will have
  been completed and the second request will fail (the old password is
  no longer valid). To attempt to fix this, we save the IP address and
  port of each request and ignore any subsequent requests from the
  same IP and same port that arrive within five minutes of each other.

usr.sbin/rpc.yppasswdd/yppasswdd_server.c

@@ -29,7 +29,7 @@
  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  * SUCH DAMAGE.
  *
- *	$Id: yppasswdd_server.c,v 1.5 1996/06/23 22:44:06 wpaul Exp $
+ *	$Id: yppasswdd_server.c,v 1.6 1996/07/01 19:38:38 guido Exp $
  */
 
 #include <stdio.h>
@@ -61,7 +61,7 @@ struct dom_binding {};
 #include "yppasswd_comm.h"
 
 #ifndef lint
-static const char rcsid[] = "$Id: yppasswdd_server.c,v 1.5 1996/06/23 22:44:06 wpaul Exp $";
+static const char rcsid[] = "$Id: yppasswdd_server.c,v 1.6 1996/07/01 19:38:38 guido Exp $";
 #endif /* not lint */
 
 char *tempname;
@@ -420,6 +420,19 @@ static int update_inplace(pw, domain)
 	return(0);
 }
 
+static char *yp_mktmpnam()
+{
+	static char path[MAXPATHLEN];
+	char *p;
+
+	sprintf(path,"%s",passfile);
+	if ((p = strrchr(path, '/')))
+		++p;
+	else
+		p = path;
+	strcpy(p, "yppwtmp.XXXXXX");
+	return(mktemp(path));
+}
 
 int *
 yppasswdproc_update_1_svc(yppasswd *argp, struct svc_req *rqstp)
@@ -437,8 +450,9 @@ yppasswdproc_update_1_svc(yppasswd *argp, struct svc_req *rqstp)
 	char *oldgecos = NULL;
 	char *passfile_hold;
 	char passfile_buf[MAXPATHLEN + 2];
-	char template[] = "/etc/yppwtmp.XXXXX";
 	char *domain = yppasswd_domain;
+	static struct sockaddr_in clntaddr;
+	static struct timeval t_saved, t_test;
 
 	/*
 	 * Normal user updates always use the 'default' master.passwd file.
@@ -449,6 +463,20 @@ yppasswdproc_update_1_svc(yppasswd *argp, struct svc_req *rqstp)
 
 	rqhost = svc_getcaller(rqstp->rq_xprt);
 
+	gettimeofday(&t_test, NULL);
+	if (!bcmp((char *)rqhost, (char *)&clntaddr,
+						sizeof(struct sockaddr_in)) &&
+		t_test.tv_sec > t_saved.tv_sec &&
+		t_test.tv_sec - t_saved.tv_sec < 300) {
+
+		bzero((char *)&clntaddr, sizeof(struct sockaddr_in));
+		bzero((char *)&t_saved, sizeof(struct timeval));
+		return(NULL);
+	}
+
+	bcopy((char *)rqhost, (char *)&clntaddr, sizeof(struct sockaddr_in));
+	gettimeofday(&t_saved, NULL);
+
 	if (yp_access(resvport ? "master.passwd.byname" : NULL, rqstp)) {
 		yp_error("rejected update request from unauthorized host");
 		svcerr_auth(rqstp->rq_xprt, AUTH_BADCRED);
@@ -562,7 +590,7 @@ cleaning up and bailing out");
 		return(&result);
 	}
 
-	passfile_hold = mktemp((char *)&template);
+	passfile_hold = yp_mktmpnam();
 	rename(passfile, passfile_hold);
 	if (strcmp(passfile, _PATH_MASTERPASSWD)) {
 		rename(tempname, passfile);
@@ -581,7 +609,6 @@ cleaning up and bailing out");
 
 	switch((pid = fork())) {
 	case 0:
-		/* unlink(passfile_hold); */
 		if (inplace && !rval) {
     			execlp(MAP_UPDATE_PATH, MAP_UPDATE, passfile,
 				yppasswd_domain, "pushpw", NULL);
@@ -597,11 +624,12 @@ cleaning up and bailing out");
 		break;
 	case -1:
 		yp_error("fork() failed: %s", strerror(errno));
-		return(&result);
 		unlink(passfile);
 		rename(passfile_hold, passfile);
+		return(&result);
 		break;
 	default:
+		unlink(passfile_hold);
 		break;
 	}
 
@@ -624,7 +652,6 @@ cleaning up and bailing out");
 
 	result = 0;
 	return (&result);
-
 }
 
 /*
@@ -641,7 +668,6 @@ static int update_master(master_yppasswd *argp)
 	DBT key, data;
 	char *passfile_hold;
 	char passfile_buf[MAXPATHLEN + 2];
-	char template[] = "/etc/yppwtmp.XXXXX";
 
 	result = 1;
 	passfile = passfile_default;
@@ -713,7 +739,7 @@ cleaning up and bailing out");
 		return(result);
 	}
 
-	passfile_hold = mktemp((char *)&template);
+	passfile_hold = yp_mktmpnam();
 	rename(passfile, passfile_hold);
 	if (strcmp(passfile, _PATH_MASTERPASSWD)) {
 		rename(tempname, passfile);
@@ -754,6 +780,7 @@ cleaning up and bailing out");
 		return(result);
 		break;
 	default:
+		unlink(passfile_hold);
 		break;
 	}