rwall.c revision 302408
1193326Sed/* 2193326Sed * Copyright (c) 1993 Christopher G. Demetriou 3193326Sed * Copyright (c) 1988, 1990 Regents of the University of California. 4193326Sed * All rights reserved. 5193326Sed * 6193326Sed * Redistribution and use in source and binary forms, with or without 7193326Sed * modification, are permitted provided that the following conditions 8193326Sed * are met: 9193326Sed * 1. Redistributions of source code must retain the above copyright 10193326Sed * notice, this list of conditions and the following disclaimer. 11193326Sed * 2. Redistributions in binary form must reproduce the above copyright 12193326Sed * notice, this list of conditions and the following disclaimer in the 13193326Sed * documentation and/or other materials provided with the distribution. 14221345Sdim * 3. All advertising materials mentioning features or use of this software 15193326Sed * must display the following acknowledgement: 16199482Srdivacky * This product includes software developed by the University of 17193326Sed * California, Berkeley and its contributors. 18193326Sed * 4. Neither the name of the University nor the names of its contributors 19226890Sdim * may be used to endorse or promote products derived from this software 20218893Sdim * without specific prior written permission. 21193326Sed * 22193326Sed * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23193326Sed * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24221345Sdim * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25221345Sdim * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26193326Sed * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27193326Sed * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28207619Srdivacky * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29207619Srdivacky * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30193326Sed * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31207619Srdivacky * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32193326Sed * SUCH DAMAGE. 33218893Sdim */ 34193326Sed 35193326Sed#ifndef lint 36193326Sedstatic const char copyright[] = 37226890Sdim"@(#) Copyright (c) 1988 Regents of the University of California.\n\ 38226890Sdim All rights reserved.\n"; 39193326Sed#endif /* not lint */ 40193326Sed 41193326Sed#ifndef lint 42193326Sedstatic const char sccsid[] = "from: @(#)wall.c 5.14 (Berkeley) 3/2/91"; 43193326Sed#endif 44193326Sed 45210299Sed#include <sys/cdefs.h> 46210299Sed__FBSDID("$FreeBSD: stable/11/usr.bin/rwall/rwall.c 227180 2011-11-06 08:16:53Z ed $"); 47226890Sdim 48193326Sed/* 49193326Sed * This program is not related to David Wall, whose Stanford Ph.D. thesis 50193326Sed * is entitled "Mechanisms for Broadcast and Selective Broadcast". 51193326Sed */ 52193326Sed 53193326Sed#include <sys/param.h> 54198398Srdivacky#include <sys/stat.h> 55198092Srdivacky#include <sys/uio.h> 56198092Srdivacky#include <rpc/rpc.h> 57195341Sed#include <rpcsvc/rwall.h> 58199990Srdivacky#include <err.h> 59207619Srdivacky#include <paths.h> 60226890Sdim#include <pwd.h> 61226890Sdim#include <stdio.h> 62226890Sdim#include <stdlib.h> 63193326Sed#include <string.h> 64193326Sed#include <time.h> 65193326Sed#include <unistd.h> 66193326Sed 67199482Srdivackystatic char *mbuf; 68193326Sed 69218893Sdimstatic char notty[] = "no tty"; 70226890Sdim 71226890Sdimstatic void makemsg(const char *); 72208600Srdivackystatic void usage(void); 73210299Sed 74210299Sed/* ARGSUSED */ 75210299Sedint 76212904Sdimmain(int argc, char *argv[]) 77212904Sdim{ 78212904Sdim char *wallhost, res; 79221345Sdim CLIENT *cl; 80221345Sdim struct timeval tv; 81221345Sdim 82221345Sdim if ((argc < 2) || (argc > 3)) 83221345Sdim usage(); 84221345Sdim 85221345Sdim wallhost = argv[1]; 86193326Sed 87193326Sed makemsg(argv[2]); 88193326Sed 89193326Sed /* 90193326Sed * Create client "handle" used for calling MESSAGEPROG on the 91193326Sed * server designated on the command line. We tell the rpc package 92193326Sed * to use the "tcp" protocol when contacting the server. 93193326Sed */ 94193326Sed cl = clnt_create(wallhost, WALLPROG, WALLVERS, "udp"); 95226890Sdim if (cl == NULL) { 96193326Sed /* 97193326Sed * Couldn't establish connection with server. 98193326Sed * Print error message and die. 99193326Sed */ 100193326Sed errx(1, "%s", clnt_spcreateerror(wallhost)); 101193326Sed } 102193326Sed 103193326Sed tv.tv_sec = 15; /* XXX ?? */ 104193326Sed tv.tv_usec = 0; 105193326Sed if (clnt_call(cl, WALLPROC_WALL, (xdrproc_t)xdr_wrapstring, &mbuf, 106193326Sed (xdrproc_t)xdr_void, &res, tv) != RPC_SUCCESS) { 107198398Srdivacky /* 108198398Srdivacky * An error occurred while calling the server. 109198398Srdivacky * Print error message and die. 110198398Srdivacky */ 111226890Sdim errx(1, "%s", clnt_sperror(cl, wallhost)); 112198398Srdivacky } 113198398Srdivacky 114198398Srdivacky return (0); 115198398Srdivacky} 116198398Srdivacky 117198398Srdivackystatic void 118198398Srdivackyusage(void) 119198398Srdivacky{ 120198398Srdivacky fprintf(stderr, "usage: rwall host [file]\n"); 121198398Srdivacky exit(1); 122198398Srdivacky} 123218893Sdim 124198398Srdivackystatic void 125198398Srdivackymakemsg(const char *fname) 126198398Srdivacky{ 127226890Sdim struct tm *lt; 128199482Srdivacky struct passwd *pw; 129198398Srdivacky struct stat sbuf; 130199482Srdivacky time_t now; 131198398Srdivacky FILE *fp; 132199482Srdivacky int fd; 133198398Srdivacky size_t mbufsize; 134199482Srdivacky char *tty, hostname[MAXHOSTNAMELEN], lbuf[256], tmpname[64]; 135198398Srdivacky const char *whom; 136198398Srdivacky 137198398Srdivacky snprintf(tmpname, sizeof(tmpname), "%s/wall.XXXXXX", _PATH_TMP); 138198398Srdivacky if ((fd = mkstemp(tmpname)) == -1 || (fp = fdopen(fd, "r+")) == NULL) 139218893Sdim err(1, "can't open temporary file"); 140199482Srdivacky unlink(tmpname); 141199482Srdivacky 142199482Srdivacky whom = getlogin(); 143226890Sdim if (!whom) { 144199482Srdivacky pw = getpwuid(getuid()); 145199482Srdivacky whom = pw ? pw->pw_name : "???"; 146199482Srdivacky } 147199482Srdivacky gethostname(hostname, sizeof(hostname)); 148199482Srdivacky time(&now); 149199482Srdivacky lt = localtime(&now); 150199482Srdivacky 151199482Srdivacky /* 152199482Srdivacky * all this stuff is to blank out a square for the message; 153199482Srdivacky * we wrap message lines at column 79, not 80, because some 154199482Srdivacky * terminals wrap after 79, some do not, and we can't tell. 155198893Srdivacky * Which means that we may leave a non-blank character 156198398Srdivacky * in column 80, but that can't be helped. 157218893Sdim */ 158198398Srdivacky fprintf(fp, "Remote Broadcast Message from %s@%s\n", 159226890Sdim whom, hostname); 160198398Srdivacky tty = ttyname(STDERR_FILENO); 161198398Srdivacky if (tty == NULL) 162198398Srdivacky tty = notty; 163218893Sdim fprintf(fp, " (%s) at %d:%02d ...\n", tty, 164198398Srdivacky lt->tm_hour, lt->tm_min); 165198398Srdivacky 166198398Srdivacky putc('\n', fp); 167198398Srdivacky 168218893Sdim if (fname && !(freopen(fname, "r", stdin))) 169198398Srdivacky err(1, "can't read %s", fname); 170198398Srdivacky while (fgets(lbuf, sizeof(lbuf), stdin)) 171198398Srdivacky fputs(lbuf, fp); 172198398Srdivacky rewind(fp); 173199482Srdivacky 174199482Srdivacky if (fstat(fd, &sbuf)) 175199482Srdivacky err(1, "can't stat temporary file"); 176199482Srdivacky mbufsize = (size_t)sbuf.st_size; 177207619Srdivacky mbuf = malloc(mbufsize); 178207619Srdivacky if (mbuf == NULL) 179207619Srdivacky err(1, "out of memory"); 180199482Srdivacky if (fread(mbuf, sizeof(*mbuf), mbufsize, fp) != (u_int)mbufsize) 181199482Srdivacky err(1, "can't read temporary file"); 182198398Srdivacky close(fd); 183193326Sed} 184193326Sed