/* $NetBSD: rwall.c,v 1.17 2008/07/21 14:19:25 lukem Exp $ */ /* * 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. */ /* * Copyright (c) 1993 Christopher G. Demetriou * * 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. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. 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. */ #include #ifndef lint __COPYRIGHT("@(#) Copyright (c) 1988\ Regents of the University of California. All rights reserved."); #endif /* not lint */ #ifndef lint #if 0 static char sccsid[] = "from: @(#)wall.c 5.14 (Berkeley) 3/2/91"; #else __RCSID("$NetBSD: rwall.c,v 1.17 2008/07/21 14:19:25 lukem Exp $"); #endif #endif /* not lint */ /* * This program is not related to David Wall, whose Stanford Ph.D. thesis * is entitled "Mechanisms for Broadcast and Selective Broadcast". */ #include #include #include #include #include #include #include #include #include #include #include #include #include static struct timeval timeout = { 25, 0 }; static char *makemsg(const char *); int main(int argc, char **argv) { char *wallhost, res; CLIENT *cl; char *mbuf; setprogname(*argv); if ((argc < 2) || (argc > 3)) { (void)fprintf(stderr, "Usage: %s hostname \n", getprogname()); return 1; } wallhost = argv[1]; /* * 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); return 1; } mbuf = makemsg(argv[2]); if (clnt_call(cl, WALLPROC_WALL, xdr_wrapstring, (void *)&mbuf, xdr_void, &res, timeout) != RPC_SUCCESS) { free(mbuf); /* * An error occurred while calling the server. * Print error message and die. */ clnt_perror(cl, wallhost); return 1; } free(mbuf); return 0; } static char * makemsg(const char *fname) { struct tm *lt; struct passwd *pw; struct stat sbuf; time_t now; size_t mbufsize; char *mbuf; FILE *fp; int fd; const char *whom; const char *tty; char tmpname[MAXPATHLEN], lbuf[BUFSIZ], hostname[MAXHOSTNAMELEN + 1]; (void)snprintf(tmpname, sizeof(tmpname), "%s/wall.XXXXXX", _PATH_TMP); if ((fd = mkstemp(tmpname)) == -1 || (fp = fdopen(fd, "r+")) == NULL) 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)); hostname[sizeof(hostname) - 1] = '\0'; (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); tty = ttyname(STDERR_FILENO); if (tty == NULL) tty = "??"; (void)fprintf(fp, " (%s) at %d:%02d ...\n", tty, lt->tm_hour, lt->tm_min); (void)putc('\n', fp); if (fname && !(freopen(fname, "r", stdin))) err(1, "Can't open `%s'", fname); while (fgets(lbuf, sizeof(lbuf), stdin)) (void)fputs(lbuf, fp); rewind(fp); if (fstat(fd, &sbuf) == -1) err(1, "Can't stat temporary file."); mbufsize = (size_t)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); return mbuf; }