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/* $OpenBSD: rwall.c,v 1.12 2009/10/27 23:59:43 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/param.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <pwd.h>
#include <unistd.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[MAXHOSTNAMELEN], lbuf[100], tmpname[MAXPATHLEN];
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);
}
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