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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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} |