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 /* 38 * This program is not related to David Wall, whose Stanford Ph.D. thesis 39 * is entitled "Mechanisms for Broadcast and Selective Broadcast". 40 */ 41 42 #include <sys/param.h> 43 #include <sys/stat.h> 44 #include <sys/uio.h> 45 #include <rpc/rpc.h> 46 #include <rpcsvc/rwall.h> 47 #include <err.h> 48 #include <paths.h> 49 #include <pwd.h> 50 #include <stdio.h> 51 #include <stdlib.h> 52 #include <string.h> 53 #include <time.h> 54 #include <unistd.h> 55 56 static char *mbuf; 57 58 static char notty[] = "no tty"; 59 60 static void makemsg(const char *); 61 static void usage(void) __dead2; 62 63 /* ARGSUSED */ 64 int 65 main(int argc, char *argv[]) 66 { 67 char *wallhost, res; 68 CLIENT *cl; 69 struct timeval tv; 70 71 if ((argc < 2) || (argc > 3)) 72 usage(); 73 74 wallhost = argv[1]; 75 76 makemsg(argv[2]); 77 78 /* 79 * Create client "handle" used for calling MESSAGEPROG on the 80 * server designated on the command line. We tell the rpc package 81 * to use the "tcp" protocol when contacting the server. 82 */ 83 cl = clnt_create(wallhost, WALLPROG, WALLVERS, "udp"); 84 if (cl == NULL) { 85 /* 86 * Couldn't establish connection with server. 87 * Print error message and die. 88 */ 89 errx(1, "%s", clnt_spcreateerror(wallhost)); 90 } 91 92 tv.tv_sec = 15; /* XXX ?? */ 93 tv.tv_usec = 0; 94 if (clnt_call(cl, WALLPROC_WALL, (xdrproc_t)xdr_wrapstring, &mbuf, 95 (xdrproc_t)xdr_void, &res, tv) != RPC_SUCCESS) { 96 /* 97 * An error occurred while calling the server. 98 * Print error message and die. 99 */ 100 errx(1, "%s", clnt_sperror(cl, wallhost)); 101 } 102 103 return (0); 104 } 105 106 static void 107 usage(void) 108 { 109 fprintf(stderr, "usage: rwall host [file]\n"); 110 exit(1); 111 } 112 113 static void 114 makemsg(const char *fname) 115 { 116 struct tm *lt; 117 struct passwd *pw; 118 struct stat sbuf; 119 time_t now; 120 FILE *fp; 121 int fd; 122 size_t mbufsize; 123 char *tty, hostname[MAXHOSTNAMELEN], lbuf[256], tmpname[64]; 124 const char *whom; 125 126 snprintf(tmpname, sizeof(tmpname), "%s/wall.XXXXXX", _PATH_TMP); 127 if ((fd = mkstemp(tmpname)) == -1 || (fp = fdopen(fd, "r+")) == NULL) 128 err(1, "can't open temporary file"); 129 unlink(tmpname); 130 131 whom = getlogin(); 132 if (!whom) { 133 pw = getpwuid(getuid()); 134 whom = pw ? pw->pw_name : "???"; 135 } 136 gethostname(hostname, sizeof(hostname)); 137 time(&now); 138 lt = localtime(&now); 139 140 /* 141 * all this stuff is to blank out a square for the message; 142 * we wrap message lines at column 79, not 80, because some 143 * terminals wrap after 79, some do not, and we can't tell. 144 * Which means that we may leave a non-blank character 145 * in column 80, but that can't be helped. 146 */ 147 fprintf(fp, "Remote Broadcast Message from %s@%s\n", 148 whom, hostname); 149 tty = ttyname(STDERR_FILENO); 150 if (tty == NULL) 151 tty = notty; 152 fprintf(fp, " (%s) at %d:%02d ...\n", tty, 153 lt->tm_hour, lt->tm_min); 154 155 putc('\n', fp); 156 157 if (fname && !(freopen(fname, "r", stdin))) 158 err(1, "can't read %s", fname); 159 while (fgets(lbuf, sizeof(lbuf), stdin)) 160 fputs(lbuf, fp); 161 rewind(fp); 162 163 if (fstat(fd, &sbuf)) 164 err(1, "can't stat temporary file"); 165 mbufsize = (size_t)sbuf.st_size; 166 mbuf = malloc(mbufsize); 167 if (mbuf == NULL) 168 err(1, "out of memory"); 169 if (fread(mbuf, sizeof(*mbuf), mbufsize, fp) != (u_int)mbufsize) 170 err(1, "can't read temporary file"); 171 close(fd); 172 } 173