1 /* $OpenBSD: rwall.c,v 1.11 2008/07/09 19:41:56 sobrado Exp $ */ 2 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. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33 #ifndef lint 34 char copyright[] = 35 "@(#) Copyright (c) 1988 Regents of the University of California.\n\ 36 All rights reserved.\n"; 37 #endif /* not lint */ 38 39 #ifndef lint 40 /*static char sccsid[] = "from: @(#)wall.c 5.14 (Berkeley) 3/2/91";*/ 41 static char rcsid[] = "$OpenBSD: rwall.c,v 1.11 2008/07/09 19:41:56 sobrado Exp $"; 42 #endif /* not lint */ 43 44 /* 45 * This program is not related to David Wall, whose Stanford Ph.D. thesis 46 * is entitled "Mechanisms for Broadcast and Selective Broadcast". 47 */ 48 49 #include <stdio.h> 50 #include <stdlib.h> 51 #include <string.h> 52 #include <time.h> 53 #include <sys/param.h> 54 #include <sys/types.h> 55 #include <sys/stat.h> 56 #include <pwd.h> 57 #include <unistd.h> 58 #include <paths.h> 59 #include <err.h> 60 61 #include <rpc/rpc.h> 62 #include <rpcsvc/rwall.h> 63 64 struct timeval timeout = { 25, 0 }; 65 int mbufsize; 66 char *mbuf; 67 68 void makemsg(char *); 69 70 int 71 main(int argc, char *argv[]) 72 { 73 extern char *__progname; 74 char *wallhost, res; 75 CLIENT *cl; 76 77 if ((argc < 2) || (argc > 3)) { 78 fprintf(stderr, "usage: %s host [file]\n", __progname); 79 exit(1); 80 } 81 82 wallhost = argv[1]; 83 84 makemsg(argv[2]); 85 86 /* 87 * Create client "handle" used for calling MESSAGEPROG on the 88 * server designated on the command line. We tell the rpc package 89 * to use the "tcp" protocol when contacting the server. 90 */ 91 cl = clnt_create(wallhost, WALLPROG, WALLVERS, "udp"); 92 if (cl == NULL) { 93 /* 94 * Couldn't establish connection with server. 95 * Print error message and die. 96 */ 97 clnt_pcreateerror(wallhost); 98 exit(1); 99 } 100 101 if (clnt_call(cl, WALLPROC_WALL, xdr_wrapstring, &mbuf, xdr_void, 102 &res, timeout) != RPC_SUCCESS) { 103 /* 104 * An error occurred while calling the server. 105 * Print error message and die. 106 */ 107 clnt_perror(cl, wallhost); 108 exit(1); 109 } 110 111 exit(0); 112 } 113 114 void 115 makemsg(char *fname) 116 { 117 struct tm *lt; 118 struct passwd *pw; 119 struct stat sbuf; 120 time_t now; 121 FILE *fp; 122 int fd; 123 char *whom, hostname[MAXHOSTNAMELEN], lbuf[100], tmpname[MAXPATHLEN]; 124 125 snprintf(tmpname, sizeof(tmpname), "%s/wall.XXXXXXXXXX", _PATH_TMP); 126 if ((fd = mkstemp(tmpname)) == -1 || !(fp = fdopen(fd, "r+"))) 127 err(1, "can't open temporary file"); 128 (void)unlink(tmpname); 129 130 if (!(whom = getlogin())) 131 whom = (pw = getpwuid(getuid())) ? pw->pw_name : "???"; 132 (void)gethostname(hostname, sizeof(hostname)); 133 (void)time(&now); 134 lt = localtime(&now); 135 136 /* 137 * all this stuff is to blank out a square for the message; 138 * we wrap message lines at column 79, not 80, because some 139 * terminals wrap after 79, some do not, and we can't tell. 140 * Which means that we may leave a non-blank character 141 * in column 80, but that can't be helped. 142 */ 143 (void)fprintf(fp, "Remote Broadcast Message from %s@%s\n", 144 whom, hostname); 145 (void)fprintf(fp, " (%s) at %d:%02d ...\n", ttyname(2), 146 lt->tm_hour, lt->tm_min); 147 148 putc('\n', fp); 149 150 if (fname && !(freopen(fname, "r", stdin))) 151 err(1, "%s", fname); 152 while (fgets(lbuf, sizeof(lbuf), stdin)) 153 fputs(lbuf, fp); 154 rewind(fp); 155 156 if (fstat(fd, &sbuf)) 157 err(1, "can't stat temporary file"); 158 mbufsize = sbuf.st_size; 159 if (!(mbuf = malloc((u_int)mbufsize))) 160 err(1, "malloc"); 161 if (fread(mbuf, sizeof(*mbuf), mbufsize, fp) != mbufsize) 162 err(1, "can't read temporary file"); 163 (void)close(fd); 164 } 165