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 static const 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 #if 0 43 static char sccsid[] = "from: @(#)wall.c 5.14 (Berkeley) 3/2/91"; 44 #endif 45 static const char rcsid[] = 46 "$Id: rwall.c,v 1.5 1997/02/22 19:56:55 peter Exp $"; 47 #endif /* not lint */ 48 49 /* 50 * This program is not related to David Wall, whose Stanford Ph.D. thesis 51 * is entitled "Mechanisms for Broadcast and Selective Broadcast". 52 */ 53 54 #include <sys/param.h> 55 #include <sys/stat.h> 56 #include <sys/time.h> 57 #include <sys/uio.h> 58 #include <err.h> 59 #include <paths.h> 60 #include <pwd.h> 61 #include <stdio.h> 62 #include <stdlib.h> 63 #include <string.h> 64 #include <unistd.h> 65 #include <utmp.h> 66 67 #include <rpc/rpc.h> 68 #include <rpcsvc/rwall.h> 69 70 int mbufsize; 71 char *mbuf; 72 73 void makemsg __P((char *)); 74 static void usage __P((void)); 75 76 /* ARGSUSED */ 77 int 78 main(argc, argv) 79 int argc; 80 char **argv; 81 { 82 char *wallhost, res; 83 CLIENT *cl; 84 struct timeval tv; 85 86 if ((argc < 2) || (argc > 3)) 87 usage(); 88 89 wallhost = argv[1]; 90 91 makemsg(argv[2]); 92 93 /* 94 * Create client "handle" used for calling MESSAGEPROG on the 95 * server designated on the command line. We tell the rpc package 96 * to use the "tcp" protocol when contacting the server. 97 */ 98 cl = clnt_create(wallhost, WALLPROG, WALLVERS, "udp"); 99 if (cl == NULL) { 100 /* 101 * Couldn't establish connection with server. 102 * Print error message and die. 103 */ 104 errx(1, "%s", clnt_spcreateerror(wallhost)); 105 } 106 107 tv.tv_sec = 15; /* XXX ?? */ 108 tv.tv_usec = 0; 109 if (clnt_call(cl, WALLPROC_WALL, xdr_wrapstring, &mbuf, xdr_void, &res, tv) != RPC_SUCCESS) { 110 /* 111 * An error occurred while calling the server. 112 * Print error message and die. 113 */ 114 errx(1, "%s", clnt_sperror(cl, wallhost)); 115 } 116 117 exit(0); 118 } 119 120 static void 121 usage() 122 { 123 fprintf(stderr, "usage: rwall hostname [file]\n"); 124 exit(1); 125 } 126 127 void 128 makemsg(fname) 129 char *fname; 130 { 131 struct tm *lt; 132 struct passwd *pw; 133 struct stat sbuf; 134 time_t now, time(); 135 FILE *fp; 136 int fd; 137 char *whom, hostname[MAXHOSTNAMELEN], lbuf[100], tmpname[15]; 138 139 (void)strcpy(tmpname, _PATH_TMP); 140 (void)strcat(tmpname, "wall.XXXXXX"); 141 if (!(fd = mkstemp(tmpname)) || !(fp = fdopen(fd, "r+"))) 142 errx(1, "can't open temporary file"); 143 (void)unlink(tmpname); 144 145 if (!(whom = getlogin())) 146 whom = (pw = getpwuid(getuid())) ? pw->pw_name : "???"; 147 (void)gethostname(hostname, sizeof(hostname)); 148 (void)time(&now); 149 lt = localtime(&now); 150 151 /* 152 * all this stuff is to blank out a square for the message; 153 * we wrap message lines at column 79, not 80, because some 154 * terminals wrap after 79, some do not, and we can't tell. 155 * Which means that we may leave a non-blank character 156 * in column 80, but that can't be helped. 157 */ 158 (void)fprintf(fp, "Remote Broadcast Message from %s@%s\n", 159 whom, hostname); 160 (void)fprintf(fp, " (%s) at %d:%02d ...\n", ttyname(2), 161 lt->tm_hour, lt->tm_min); 162 163 putc('\n', fp); 164 165 if (fname && !(freopen(fname, "r", stdin))) 166 errx(1, "can't read %s", fname); 167 while (fgets(lbuf, sizeof(lbuf), stdin)) 168 fputs(lbuf, fp); 169 rewind(fp); 170 171 if (fstat(fd, &sbuf)) 172 errx(1, "can't stat temporary file"); 173 mbufsize = sbuf.st_size; 174 if (!(mbuf = malloc((u_int)mbufsize))) 175 errx(1, "out of memory"); 176 if (fread(mbuf, sizeof(*mbuf), mbufsize, fp) != mbufsize) 177 errx(1, "can't read temporary file"); 178 (void)close(fd); 179 } 180