GCC Code Coverage Report
Directory: ./ Exec Total Coverage
File: usr.bin/rwall/rwall.c Lines: 0 38 0.0 %
Date: 2016-12-06 Branches: 0 28 0.0 %

Line Branch Exec Source
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/*	$OpenBSD: rwall.c,v 1.13 2015/01/16 06:40:11 deraadt Exp $	*/
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/*
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 * Copyright (c) 1993 Christopher G. Demetriou
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 * Copyright (c) 1988, 1990 Regents of the University of California.
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 * All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 * 1. Redistributions of source code must retain the above copyright
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 *    notice, this list of conditions and the following disclaimer.
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 * 2. Redistributions in binary form must reproduce the above copyright
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 *    notice, this list of conditions and the following disclaimer in the
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 *    documentation and/or other materials provided with the distribution.
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 * 3. Neither the name of the University nor the names of its contributors
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 *    may be used to endorse or promote products derived from this software
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 *    without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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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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/*
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 * This program is not related to David Wall, whose Stanford Ph.D. thesis
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 * is entitled "Mechanisms for Broadcast and Selective Broadcast".
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 */
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <time.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <pwd.h>
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#include <unistd.h>
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#include <limits.h>
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#include <paths.h>
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#include <err.h>
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#include <rpc/rpc.h>
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#include <rpcsvc/rwall.h>
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struct timeval timeout = { 25, 0 };
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int mbufsize;
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char *mbuf;
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void makemsg(char *);
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int
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main(int argc, char *argv[])
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{
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	extern char *__progname;
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	char *wallhost, res;
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	CLIENT *cl;
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	if ((argc < 2) || (argc > 3)) {
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		fprintf(stderr, "usage: %s host [file]\n", __progname);
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		exit(1);
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	}
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	wallhost = argv[1];
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	makemsg(argv[2]);
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	/*
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	 * Create client "handle" used for calling MESSAGEPROG on the
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	 * server designated on the command line. We tell the rpc package
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	 * to use the "tcp" protocol when contacting the server.
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	*/
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	cl = clnt_create(wallhost, WALLPROG, WALLVERS, "udp");
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	if (cl == NULL) {
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		/*
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		 * Couldn't establish connection with server.
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		 * Print error message and die.
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		 */
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		clnt_pcreateerror(wallhost);
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		exit(1);
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	}
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	if (clnt_call(cl, WALLPROC_WALL, xdr_wrapstring, &mbuf, xdr_void,
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	    &res, timeout) != RPC_SUCCESS) {
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		/*
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		 * An error occurred while calling the server.
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		 * Print error message and die.
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		 */
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		clnt_perror(cl, wallhost);
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		exit(1);
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	}
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	exit(0);
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}
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void
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makemsg(char *fname)
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{
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	struct tm *lt;
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	struct passwd *pw;
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	struct stat sbuf;
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	time_t now;
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	FILE *fp;
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	int fd;
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	char *whom, hostname[HOST_NAME_MAX+1], lbuf[100], tmpname[PATH_MAX];
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	snprintf(tmpname, sizeof(tmpname), "%s/wall.XXXXXXXXXX", _PATH_TMP);
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	if ((fd = mkstemp(tmpname)) == -1 || !(fp = fdopen(fd, "r+")))
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		err(1, "can't open temporary file");
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	(void)unlink(tmpname);
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	if (!(whom = getlogin()))
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		whom = (pw = getpwuid(getuid())) ? pw->pw_name : "???";
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	(void)gethostname(hostname, sizeof(hostname));
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	(void)time(&now);
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	lt = localtime(&now);
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	/*
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	 * all this stuff is to blank out a square for the message;
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	 * we wrap message lines at column 79, not 80, because some
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	 * terminals wrap after 79, some do not, and we can't tell.
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	 * Which means that we may leave a non-blank character
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	 * in column 80, but that can't be helped.
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	 */
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	(void)fprintf(fp, "Remote Broadcast Message from %s@%s\n",
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	    whom, hostname);
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	(void)fprintf(fp, "        (%s) at %d:%02d ...\n", ttyname(2),
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	    lt->tm_hour, lt->tm_min);
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	putc('\n', fp);
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	if (fname && !(freopen(fname, "r", stdin)))
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		err(1, "%s", fname);
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	while (fgets(lbuf, sizeof(lbuf), stdin))
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		fputs(lbuf, fp);
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	rewind(fp);
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	if (fstat(fd, &sbuf))
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		err(1, "can't stat temporary file");
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	mbufsize = sbuf.st_size;
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	if (!(mbuf = malloc((u_int)mbufsize)))
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		err(1, "malloc");
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	if (fread(mbuf, sizeof(*mbuf), mbufsize, fp) != mbufsize)
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		err(1, "can't read temporary file");
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	(void)close(fd);
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}