1 /* 2 * Copyright (c) 1993 Christopher G. Demetriou 3 * Copyright (c) 1988, 1990 Regents of the University of California. 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. All advertising materials mentioning features or use of this software 15 * must display the following acknowledgement: 16 * This product includes software developed by the University of 17 * California, Berkeley and its contributors. 18 * 4. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 */ 34 35 #ifndef lint 36 char copyright[] = 37 "@(#) Copyright (c) 1988 Regents of the University of California.\n\ 38 All rights reserved.\n"; 39 #endif /* not lint */ 40 41 #ifndef lint 42 /*static char sccsid[] = "from: @(#)wall.c 5.14 (Berkeley) 3/2/91";*/ 43 static char rcsid[] = "$Id: rwall.c,v 1.1.1.1 1994/08/28 15:11:02 csgr Exp $"; 44 #endif /* not lint */ 45 46 /* 47 * This program is not related to David Wall, whose Stanford Ph.D. thesis 48 * is entitled "Mechanisms for Broadcast and Selective Broadcast". 49 */ 50 51 #include <sys/param.h> 52 #include <sys/stat.h> 53 #include <sys/time.h> 54 #include <sys/uio.h> 55 #include <utmp.h> 56 #include <pwd.h> 57 #include <stdio.h> 58 #include <stdlib.h> 59 #include <paths.h> 60 61 #include <rpc/rpc.h> 62 #include <rpcsvc/rwall.h> 63 64 int mbufsize; 65 char *mbuf; 66 67 /* ARGSUSED */ 68 main(argc, argv) 69 int argc; 70 char **argv; 71 { 72 char *wallhost, res; 73 CLIENT *cl; 74 75 if ((argc < 2) || (argc > 3)) { 76 fprintf(stderr, "usage: %s hostname [file]\n", argv[0]); 77 exit(1); 78 } 79 80 wallhost = argv[1]; 81 82 makemsg(argv[2]); 83 84 /* 85 * Create client "handle" used for calling MESSAGEPROG on the 86 * server designated on the command line. We tell the rpc package 87 * to use the "tcp" protocol when contacting the server. 88 */ 89 cl = clnt_create(wallhost, WALLPROG, WALLVERS, "udp"); 90 if (cl == NULL) { 91 /* 92 * Couldn't establish connection with server. 93 * Print error message and die. 94 */ 95 clnt_pcreateerror(wallhost); 96 exit(1); 97 } 98 99 if (clnt_call(cl, WALLPROC_WALL, xdr_wrapstring, &mbuf, xdr_void, &res, NULL) != RPC_SUCCESS) { 100 /* 101 * An error occurred while calling the server. 102 * Print error message and die. 103 */ 104 clnt_perror(cl, wallhost); 105 exit(1); 106 } 107 108 exit(0); 109 } 110 111 makemsg(fname) 112 char *fname; 113 { 114 register int ch, cnt; 115 struct tm *lt; 116 struct passwd *pw; 117 struct stat sbuf; 118 time_t now, time(); 119 FILE *fp; 120 int fd; 121 char *p, *whom, hostname[MAXHOSTNAMELEN], lbuf[100], tmpname[15]; 122 char *getlogin(), *strcpy(), *ttyname(); 123 124 (void)strcpy(tmpname, _PATH_TMP); 125 (void)strcat(tmpname, "/wall.XXXXXX"); 126 if (!(fd = mkstemp(tmpname)) || !(fp = fdopen(fd, "r+"))) { 127 (void)fprintf(stderr, "wall: can't open temporary file.\n"); 128 exit(1); 129 } 130 (void)unlink(tmpname); 131 132 if (!(whom = getlogin())) 133 whom = (pw = getpwuid(getuid())) ? pw->pw_name : "???"; 134 (void)gethostname(hostname, sizeof(hostname)); 135 (void)time(&now); 136 lt = localtime(&now); 137 138 /* 139 * all this stuff is to blank out a square for the message; 140 * we wrap message lines at column 79, not 80, because some 141 * terminals wrap after 79, some do not, and we can't tell. 142 * Which means that we may leave a non-blank character 143 * in column 80, but that can't be helped. 144 */ 145 (void)fprintf(fp, "Remote Broadcast Message from %s@%s\n", 146 whom, hostname); 147 (void)fprintf(fp, " (%s) at %d:%02d ...\n", ttyname(2), 148 lt->tm_hour, lt->tm_min); 149 150 putc('\n', fp); 151 152 if (fname && !(freopen(fname, "r", stdin))) { 153 (void)fprintf(stderr, "wall: can't read %s.\n", fname); 154 exit(1); 155 } 156 while (fgets(lbuf, sizeof(lbuf), stdin)) 157 fputs(lbuf, fp); 158 rewind(fp); 159 160 if (fstat(fd, &sbuf)) { 161 (void)fprintf(stderr, "wall: can't stat temporary file.\n"); 162 exit(1); 163 } 164 mbufsize = sbuf.st_size; 165 if (!(mbuf = malloc((u_int)mbufsize))) { 166 (void)fprintf(stderr, "wall: out of memory.\n"); 167 exit(1); 168 } 169 if (fread(mbuf, sizeof(*mbuf), mbufsize, fp) != mbufsize) { 170 (void)fprintf(stderr, "wall: can't read temporary file.\n"); 171 exit(1); 172 } 173 (void)close(fd); 174 } 175