179 lines
5.2 KiB
C
179 lines
5.2 KiB
C
/* $NetBSD: rwall.c,v 1.13 2000/10/02 03:28:42 taca 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. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. 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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#include <sys/cdefs.h>
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#ifndef lint
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__COPYRIGHT("@(#) Copyright (c) 1988 Regents of the University of California.\n\
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All rights reserved.\n");
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#endif /* not lint */
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#ifndef lint
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#if 0
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static char sccsid[] = "from: @(#)wall.c 5.14 (Berkeley) 3/2/91";
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#else
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__RCSID("$NetBSD: rwall.c,v 1.13 2000/10/02 03:28:42 taca Exp $");
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#endif
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#endif /* not lint */
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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 <sys/types.h>
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#include <sys/param.h>
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#include <sys/stat.h>
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#include <err.h>
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#include <paths.h>
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#include <pwd.h>
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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 <unistd.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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int main __P((int, char **));
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void makemsg __P((char *));
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int
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main(argc, argv)
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int argc;
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char **argv;
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{
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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 hostname [file]\n", argv[0]);
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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, (caddr_t)&mbuf, xdr_void, &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(fname)
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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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const char *whom;
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char *tty, tmpname[32], lbuf[100], hostname[MAXHOSTNAMELEN + 1];
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(void)strcpy(tmpname, _PATH_TMP);
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(void)strcat(tmpname, "/wall.XXXXXX");
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if (!(fd = mkstemp(tmpname)) || !(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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hostname[sizeof(hostname) - 1] = '\0';
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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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tty = ttyname(STDERR_FILENO);
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if (tty == NULL)
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tty = "??";
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(void)fprintf(fp, " (%s) at %d:%02d ...\n", tty, lt->tm_hour,
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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, "can't read %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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}
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