1 /*- 2 * SPDX-License-Identifier: BSD-4-Clause 3 * 4 * Copyright (c) 1993 Christopher G. Demetriou 5 * Copyright (c) 1988, 1990 Regents of the University of California. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by the University of 19 * California, Berkeley and its contributors. 20 * 4. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 */ 36 37 #ifndef lint 38 static const char copyright[] = 39 "@(#) Copyright (c) 1988 Regents of the University of California.\n\ 40 All rights reserved.\n"; 41 #endif /* not lint */ 42 43 #ifndef lint 44 static const char sccsid[] = "from: @(#)wall.c 5.14 (Berkeley) 3/2/91"; 45 #endif 46 47 #include <sys/cdefs.h> 48 __FBSDID("$FreeBSD$"); 49 50 /* 51 * This program is not related to David Wall, whose Stanford Ph.D. thesis 52 * is entitled "Mechanisms for Broadcast and Selective Broadcast". 53 */ 54 55 #include <sys/param.h> 56 #include <sys/stat.h> 57 #include <sys/uio.h> 58 #include <rpc/rpc.h> 59 #include <rpcsvc/rwall.h> 60 #include <err.h> 61 #include <paths.h> 62 #include <pwd.h> 63 #include <stdio.h> 64 #include <stdlib.h> 65 #include <string.h> 66 #include <time.h> 67 #include <unistd.h> 68 69 static char *mbuf; 70 71 static char notty[] = "no tty"; 72 73 static void makemsg(const char *); 74 static void usage(void) __dead2; 75 76 /* ARGSUSED */ 77 int 78 main(int argc, char *argv[]) 79 { 80 char *wallhost, res; 81 CLIENT *cl; 82 struct timeval tv; 83 84 if ((argc < 2) || (argc > 3)) 85 usage(); 86 87 wallhost = argv[1]; 88 89 makemsg(argv[2]); 90 91 /* 92 * Create client "handle" used for calling MESSAGEPROG on the 93 * server designated on the command line. We tell the rpc package 94 * to use the "tcp" protocol when contacting the server. 95 */ 96 cl = clnt_create(wallhost, WALLPROG, WALLVERS, "udp"); 97 if (cl == NULL) { 98 /* 99 * Couldn't establish connection with server. 100 * Print error message and die. 101 */ 102 errx(1, "%s", clnt_spcreateerror(wallhost)); 103 } 104 105 tv.tv_sec = 15; /* XXX ?? */ 106 tv.tv_usec = 0; 107 if (clnt_call(cl, WALLPROC_WALL, (xdrproc_t)xdr_wrapstring, &mbuf, 108 (xdrproc_t)xdr_void, &res, tv) != RPC_SUCCESS) { 109 /* 110 * An error occurred while calling the server. 111 * Print error message and die. 112 */ 113 errx(1, "%s", clnt_sperror(cl, wallhost)); 114 } 115 116 return (0); 117 } 118 119 static void 120 usage(void) 121 { 122 fprintf(stderr, "usage: rwall host [file]\n"); 123 exit(1); 124 } 125 126 static void 127 makemsg(const char *fname) 128 { 129 struct tm *lt; 130 struct passwd *pw; 131 struct stat sbuf; 132 time_t now; 133 FILE *fp; 134 int fd; 135 size_t mbufsize; 136 char *tty, hostname[MAXHOSTNAMELEN], lbuf[256], tmpname[64]; 137 const char *whom; 138 139 snprintf(tmpname, sizeof(tmpname), "%s/wall.XXXXXX", _PATH_TMP); 140 if ((fd = mkstemp(tmpname)) == -1 || (fp = fdopen(fd, "r+")) == NULL) 141 err(1, "can't open temporary file"); 142 unlink(tmpname); 143 144 whom = getlogin(); 145 if (!whom) { 146 pw = getpwuid(getuid()); 147 whom = pw ? pw->pw_name : "???"; 148 } 149 gethostname(hostname, sizeof(hostname)); 150 time(&now); 151 lt = localtime(&now); 152 153 /* 154 * all this stuff is to blank out a square for the message; 155 * we wrap message lines at column 79, not 80, because some 156 * terminals wrap after 79, some do not, and we can't tell. 157 * Which means that we may leave a non-blank character 158 * in column 80, but that can't be helped. 159 */ 160 fprintf(fp, "Remote Broadcast Message from %s@%s\n", 161 whom, hostname); 162 tty = ttyname(STDERR_FILENO); 163 if (tty == NULL) 164 tty = notty; 165 fprintf(fp, " (%s) at %d:%02d ...\n", tty, 166 lt->tm_hour, lt->tm_min); 167 168 putc('\n', fp); 169 170 if (fname && !(freopen(fname, "r", stdin))) 171 err(1, "can't read %s", fname); 172 while (fgets(lbuf, sizeof(lbuf), stdin)) 173 fputs(lbuf, fp); 174 rewind(fp); 175 176 if (fstat(fd, &sbuf)) 177 err(1, "can't stat temporary file"); 178 mbufsize = (size_t)sbuf.st_size; 179 mbuf = malloc(mbufsize); 180 if (mbuf == NULL) 181 err(1, "out of memory"); 182 if (fread(mbuf, sizeof(*mbuf), mbufsize, fp) != (u_int)mbufsize) 183 err(1, "can't read temporary file"); 184 close(fd); 185 } 186