154 lines
4.5 KiB
C
154 lines
4.5 KiB
C
/* $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);
|
|
}
|