--- netkit-rwall-0.17/rwall/rwall.1.netgroup	2000-07-31 01:57:05.000000000 +0200
+++ netkit-rwall-0.17/rwall/rwall.1	2004-09-02 20:13:25.000000000 +0200
@@ -42,10 +42,14 @@
 .Nm rwall
 .Ar host
 .Op Ar file
+.Nm rwall
+.Ar -n netgroup
+.Op Ar file
 .Sh DESCRIPTION
 The
 .Nm rwall
-command sends a message to the users logged into the specified host. The
+command sends a message to the users logged into the specified host or
+to users on all hosts in the specified netgroup. The
 message to be sent can be typed in and terminated with EOF or it can
 be in a
 .Ar file .
--- netkit-rwall-0.17/rwall/rwall.c.netgroup	1999-12-12 19:05:05.000000000 +0100
+++ netkit-rwall-0.17/rwall/rwall.c	2004-09-02 20:13:25.000000000 +0200
@@ -59,6 +59,7 @@
 #include <paths.h>
 
 #include <rpc/rpc.h>
+#include <rpcsvc/ypclnt.h>
 #include "rwall.h"
 
 #include "../version.h"
@@ -67,22 +68,126 @@
 static unsigned mbufsize;
 static char *mbuf;
 
+void gethostnames(const char *, char *, int);
+char *expandgroup(const char *, const char *, char *, size_t *);
+int callmsg(const char *);
 static void makemsg(const char *);
 
 int
 main(int argc, char *argv[])
 {
-	char *wallhost, res;
-	CLIENT *cl;
+	char hostname[256]=""; /* should accomodate length of most host/domain names */
 
-	if ((argc < 2) || (argc > 3)) {
+	if ((argc < 2) || (argc > 4)) {
 		fprintf(stderr, "usage: %s hostname [file]\n", argv[0]);
+		fprintf(stderr, "       %s -n netgroup [file]\n", argv[0]);
 		exit(1);
 	}
 
-	wallhost = argv[1];
+	if( strcmp("-n",argv[1])) {	/* send message to a single host */
+		makemsg(argv[2]);
+		if(callmsg(argv[1])) exit(1);
+	} else {			/* send messages to all host in a netgroup */
+		makemsg(argv[3]);
+		gethostnames(argv[2], hostname, 1);
+		if( ! strlen(hostname)){
+			fprintf(stderr,"netgroup %s not found\n", argv[2]);
+			exit(1);
+		}
+		do{
+			fprintf(stdout, "sending message to %s\n", hostname);
+			if(callmsg(hostname)){
+				fprintf(stdout, "host %s timed out\n", hostname);
+			}
+			gethostnames(argv[2], hostname, 0);
+		}while(strlen(hostname));
+		fprintf(stdout, "Done...\n");
+	}
+        exit(0);;
+}
+
+#define HLISTCHUNK	256
+
+void
+gethostnames(const char *netgroup, char *hostname, int first) 
+{
+	static char *domainname = NULL, *hlist = NULL, *hnext=NULL, *cp;
+	size_t hsize=HLISTCHUNK, error;
+
+	*hostname='\0';  /* assume failure */
+
+	if( first) {
+		hlist = (char *) malloc(hsize * sizeof(char));
+		if( ! hlist) {
+			fprintf(stderr, "%s: can't allocate %d bytes for host names\n",
+				"gethostnames", hsize * sizeof(char));
+			return;
+		}
+		*hlist = '\0';
+		if ((error = yp_get_default_domain (&domainname)) != 0) {
+ 			fprintf (stderr, "%s: can't get local yp domain: %s\n",
+ 				"gethostnames", yperr_string (error));
+			return;
+		}
+		fprintf(stdout, "Searching for netgroup %s in domain %s\n", 
+			netgroup, domainname); 
+		hnext = hlist = expandgroup(domainname, netgroup, hlist, &hsize);
+		fprintf(stdout, "Your message will be sent to the following hosts:\n");
+		fprintf(stdout, "  %s\n", hlist);
+	}
+	if( ! hlist) return; /* failed remalloc()? */
+
+	/* we have a list of space delimited hostnames... 
+	   peel one off and advance the marker */
+	cp = strchr(hnext, ' ');
+	if( ! cp) return;  /* no more */
+	*cp = '\0';
+	strcpy(hostname, hnext);
+	hnext = cp+1;
+}
+
+char *
+expandgroup(const char *domainname, const char *netgroup, char *hlist, size_t *hsize)
+{
+	char list[1024], *val = NULL, *cp, *cp2, *gotend;
+	int vallen, res;
 
-	makemsg(argv[2]);
+	res = yp_match (domainname, "netgroup", netgroup, strlen (netgroup),
+                          &val, &vallen);
+	cp = strtok_r(val, " ", (char **) &list);
+	while( cp){
+		if( *cp != '(') expandgroup(domainname, cp, hlist, hsize);
+		else {
+			gotend = strchr(cp+1, ')'); /* was closing par in this token? */
+			cp2 = strchr(cp+1,',');
+			if(cp2) *cp2 = '\0';
+			if( strlen(hlist) + strlen(cp) + 1 > *hsize) {
+				*hsize += HLISTCHUNK;  /* add more space */
+				hlist = realloc(hlist, *hsize * sizeof(char));
+				if( ! hlist) {
+					fprintf(stderr, 
+						"%s: can't reallocate %d bytes for host names\n",
+						"expandgroup", *hsize * sizeof(char));
+					return hlist;
+				}
+			}
+			strcat(hlist, cp+1);
+			strcat(hlist, " ");
+			while( ! gotend) {  /* toss everything to closing parentheses */
+				cp = strtok_r(NULL, " ", (char **) &list);
+				gotend = strchr(cp, ')');
+			}
+		}
+		cp = strtok_r(NULL, " ", (char **) &list);
+	}
+	return hlist;
+}
+
+int 
+callmsg(const char *wallhost)
+{
+	CLIENT *cl;
+	char res;
 
 	/*
 	 * Create client "handle" used for calling MESSAGEPROG on the
@@ -96,7 +201,7 @@
 		 * Print error message and die.
 		 */
 		clnt_pcreateerror(wallhost);
-		exit(1);
+		return -1;
 	}
 
 	if (clnt_call(cl, WALLPROC_WALL, 
@@ -108,10 +213,10 @@
 		 * Print error message and die.
 		 */
 		clnt_perror(cl, wallhost);
-		exit(1);
+		return -1;
 	}
 
-	exit(0);
+	return 0;
 }
 
 static void
@@ -176,4 +281,8 @@
 		exit(1);
 	}
 	(void)close(fd);
+	mbuf[mbufsize-1] = '\0'; /* terminate */
 }
+
+/* EOF */
+
--- netkit-rwall-0.17/ChangeLog.netgroup	2000-07-23 06:43:22.000000000 +0200
+++ netkit-rwall-0.17/ChangeLog	2004-09-02 20:13:25.000000000 +0200
@@ -0,0 +1,3 @@
+06-Apr-2002:
+	added option to message all hosts in a netgroup (Jack Perdue - ss@siliconslick.com)
+
--- netkit-rwall-0.17/configure.netgroup	2000-07-23 07:42:25.000000000 +0200
+++ netkit-rwall-0.17/configure	2004-09-02 20:13:25.000000000 +0200
@@ -147,7 +147,7 @@
 fi
 
 LDFLAGS=
-LIBS=
+LIBS=-lnsl
 
 rm -f __conftest*