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Replace <sys/param.h> with <limits.h> and other less dirty headers where
possible.  Annotate <sys/param.h> lines with their current reasons.  Switch
to PATH_MAX, NGROUPS_MAX, HOST_NAME_MAX+1, LOGIN_NAME_MAX, etc.  Change
MIN() and MAX() to local definitions of MINIMUM() and MAXIMUM() where
sensible to avoid pulling in the pollution.  These are the files confirmed
through binary verification.
ok guenther, millert, doug (helped with the verification protocol)

/*	$OpenBSD: rwall.c,v 1.13 2015/01/16 06:40:11 deraadt Exp $	*/

/*
 * Copyright (c) 1993 Christopher G. Demetriou
 * Copyright (c) 1988, 1990 Regents of the University of California.
 * 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. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 THE REGENTS 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.
 */

/*
 * This program is not related to David Wall, whose Stanford Ph.D. thesis
 * is entitled "Mechanisms for Broadcast and Selective Broadcast".
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <pwd.h>
#include <unistd.h>
#include <limits.h>
#include <paths.h>
#include <err.h>

#include <rpc/rpc.h>
#include <rpcsvc/rwall.h>

struct timeval timeout = { 25, 0 };
int mbufsize;
char *mbuf;

void makemsg(char *);

int
main(int argc, char *argv[])
{
	extern char *__progname;
	char *wallhost, res;
	CLIENT *cl;

	if ((argc < 2) || (argc > 3)) {
		fprintf(stderr, "usage: %s host [file]\n", __progname);
		exit(1);
	}

	wallhost = argv[1];

	makemsg(argv[2]);

	/*
	 * Create client "handle" used for calling MESSAGEPROG on the
	 * server designated on the command line. We tell the rpc package
	 * to use the "tcp" protocol when contacting the server.
	*/
	cl = clnt_create(wallhost, WALLPROG, WALLVERS, "udp");
	if (cl == NULL) {
		/*
		 * Couldn't establish connection with server.
		 * Print error message and die.
		 */
		clnt_pcreateerror(wallhost);
		exit(1);
	}

	if (clnt_call(cl, WALLPROC_WALL, xdr_wrapstring, &mbuf, xdr_void,
	    &res, timeout) != RPC_SUCCESS) {
		/*
		 * An error occurred while calling the server.
		 * Print error message and die.
		 */
		clnt_perror(cl, wallhost);
		exit(1);
	}

	exit(0);
}

void
makemsg(char *fname)
{
	struct tm *lt;
	struct passwd *pw;
	struct stat sbuf;
	time_t now;
	FILE *fp;
	int fd;
	char *whom, hostname[HOST_NAME_MAX+1], lbuf[100], tmpname[PATH_MAX];

	snprintf(tmpname, sizeof(tmpname), "%s/wall.XXXXXXXXXX", _PATH_TMP);
	if ((fd = mkstemp(tmpname)) == -1 || !(fp = fdopen(fd, "r+")))
		err(1, "can't open temporary file");
	(void)unlink(tmpname);

	if (!(whom = getlogin()))
		whom = (pw = getpwuid(getuid())) ? pw->pw_name : "???";
	(void)gethostname(hostname, sizeof(hostname));
	(void)time(&now);
	lt = localtime(&now);

	/*
	 * all this stuff is to blank out a square for the message;
	 * we wrap message lines at column 79, not 80, because some
	 * terminals wrap after 79, some do not, and we can't tell.
	 * Which means that we may leave a non-blank character
	 * in column 80, but that can't be helped.
	 */
	(void)fprintf(fp, "Remote Broadcast Message from %s@%s\n",
	    whom, hostname);
	(void)fprintf(fp, "        (%s) at %d:%02d ...\n", ttyname(2),
	    lt->tm_hour, lt->tm_min);

	putc('\n', fp);

	if (fname && !(freopen(fname, "r", stdin)))
		err(1, "%s", fname);
	while (fgets(lbuf, sizeof(lbuf), stdin))
		fputs(lbuf, fp);
	rewind(fp);

	if (fstat(fd, &sbuf))
		err(1, "can't stat temporary file");
	mbufsize = sbuf.st_size;
	if (!(mbuf = malloc((u_int)mbufsize)))
		err(1, "malloc");
	if (fread(mbuf, sizeof(*mbuf), mbufsize, fp) != mbufsize)
		err(1, "can't read temporary file");
	(void)close(fd);
}