1 /* $OpenBSD: rwall.c,v 1.13 2015/01/16 06:40:11 deraadt 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 /* 34 * This program is not related to David Wall, whose Stanford Ph.D. thesis 35 * is entitled "Mechanisms for Broadcast and Selective Broadcast". 36 */ 37 38 #include <stdio.h> 39 #include <stdlib.h> 40 #include <string.h> 41 #include <time.h> 42 #include <sys/types.h> 43 #include <sys/stat.h> 44 #include <pwd.h> 45 #include <unistd.h> 46 #include <limits.h> 47 #include <paths.h> 48 #include <err.h> 49 50 #include <rpc/rpc.h> 51 #include <rpcsvc/rwall.h> 52 53 struct timeval timeout = { 25, 0 }; 54 int mbufsize; 55 char *mbuf; 56 57 void makemsg(char *); 58 59 int 60 main(int argc, char *argv[]) 61 { 62 extern char *__progname; 63 char *wallhost, res; 64 CLIENT *cl; 65 66 if ((argc < 2) || (argc > 3)) { 67 fprintf(stderr, "usage: %s host [file]\n", __progname); 68 exit(1); 69 } 70 71 wallhost = argv[1]; 72 73 makemsg(argv[2]); 74 75 /* 76 * Create client "handle" used for calling MESSAGEPROG on the 77 * server designated on the command line. We tell the rpc package 78 * to use the "tcp" protocol when contacting the server. 79 */ 80 cl = clnt_create(wallhost, WALLPROG, WALLVERS, "udp"); 81 if (cl == NULL) { 82 /* 83 * Couldn't establish connection with server. 84 * Print error message and die. 85 */ 86 clnt_pcreateerror(wallhost); 87 exit(1); 88 } 89 90 if (clnt_call(cl, WALLPROC_WALL, xdr_wrapstring, &mbuf, xdr_void, 91 &res, timeout) != RPC_SUCCESS) { 92 /* 93 * An error occurred while calling the server. 94 * Print error message and die. 95 */ 96 clnt_perror(cl, wallhost); 97 exit(1); 98 } 99 100 exit(0); 101 } 102 103 void 104 makemsg(char *fname) 105 { 106 struct tm *lt; 107 struct passwd *pw; 108 struct stat sbuf; 109 time_t now; 110 FILE *fp; 111 int fd; 112 char *whom, hostname[HOST_NAME_MAX+1], lbuf[100], tmpname[PATH_MAX]; 113 114 snprintf(tmpname, sizeof(tmpname), "%s/wall.XXXXXXXXXX", _PATH_TMP); 115 if ((fd = mkstemp(tmpname)) == -1 || !(fp = fdopen(fd, "r+"))) 116 err(1, "can't open temporary file"); 117 (void)unlink(tmpname); 118 119 if (!(whom = getlogin())) 120 whom = (pw = getpwuid(getuid())) ? pw->pw_name : "???"; 121 (void)gethostname(hostname, sizeof(hostname)); 122 (void)time(&now); 123 lt = localtime(&now); 124 125 /* 126 * all this stuff is to blank out a square for the message; 127 * we wrap message lines at column 79, not 80, because some 128 * terminals wrap after 79, some do not, and we can't tell. 129 * Which means that we may leave a non-blank character 130 * in column 80, but that can't be helped. 131 */ 132 (void)fprintf(fp, "Remote Broadcast Message from %s@%s\n", 133 whom, hostname); 134 (void)fprintf(fp, " (%s) at %d:%02d ...\n", ttyname(2), 135 lt->tm_hour, lt->tm_min); 136 137 putc('\n', fp); 138 139 if (fname && !(freopen(fname, "r", stdin))) 140 err(1, "%s", fname); 141 while (fgets(lbuf, sizeof(lbuf), stdin)) 142 fputs(lbuf, fp); 143 rewind(fp); 144 145 if (fstat(fd, &sbuf)) 146 err(1, "can't stat temporary file"); 147 mbufsize = sbuf.st_size; 148 if (!(mbuf = malloc((u_int)mbufsize))) 149 err(1, "malloc"); 150 if (fread(mbuf, sizeof(*mbuf), mbufsize, fp) != mbufsize) 151 err(1, "can't read temporary file"); 152 (void)close(fd); 153 } 154