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 * @(#) Copyright (c) 1988 Regents of the University of California. All rights reserved. 35 * @(#)wall.c 5.14 (Berkeley) 3/2/91 36 * $FreeBSD: src/usr.bin/rwall/rwall.c,v 1.14 2005/05/21 09:55:08 ru Exp $ 37 * $DragonFly: src/usr.bin/rwall/rwall.c,v 1.7 2005/07/30 16:44:12 liamfoy Exp $ 38 */ 39 40 /* 41 * This program is not related to David Wall, whose Stanford Ph.D. thesis 42 * is entitled "Mechanisms for Broadcast and Selective Broadcast". 43 */ 44 45 #include <sys/types.h> 46 #include <sys/param.h> 47 #include <sys/stat.h> 48 49 #include <err.h> 50 #include <paths.h> 51 #include <pwd.h> 52 #include <stdio.h> 53 #include <stdlib.h> 54 #include <time.h> 55 #include <unistd.h> 56 57 #include <rpc/rpc.h> 58 #include <rpcsvc/rwall.h> 59 60 static char *mbuf; 61 62 static void makemsg(const char *); 63 static void usage(void); 64 65 int 66 main(int argc, char **argv) 67 { 68 const char *wallhost; 69 char *res; 70 CLIENT *cl; 71 struct timeval tv; 72 int c; 73 74 while ((c = getopt(argc, argv, "")) != -1) { 75 switch (c) { 76 default: 77 usage(); 78 } 79 } 80 81 argc -= optind; 82 argv += optind; 83 84 if (argc < 1 || argc > 2) 85 usage(); 86 87 wallhost = argv[0]; 88 89 /* 90 * Create client "handle" used for calling MESSAGEPROG on the 91 * server designated on the command line. We tell the rpc package 92 * to use the "tcp" protocol when contacting the server. 93 */ 94 cl = clnt_create(wallhost, WALLPROG, WALLVERS, "udp"); 95 if (cl == NULL) { 96 /* 97 * Couldn't establish connection with server. 98 * Print error message and die. 99 */ 100 clnt_pcreateerror(wallhost); 101 exit(1); 102 } 103 104 makemsg(argv[1]); 105 106 tv.tv_sec = 15; /* XXX ?? */ 107 tv.tv_usec = 0; 108 if (clnt_call(cl, WALLPROC_WALL, (xdrproc_t)xdr_wrapstring, &mbuf, 109 (xdrproc_t)xdr_void, &res, tv) != RPC_SUCCESS) { 110 /* 111 * An error occurred while calling the server. 112 * Print error message and die. 113 */ 114 clnt_perror(cl, wallhost); 115 exit(1); 116 } 117 118 return(0); 119 } 120 121 static void 122 usage(void) 123 { 124 fprintf(stderr, "usage: rwall host [file]\n"); 125 exit(1); 126 } 127 128 static void 129 makemsg(const char *fname) 130 { 131 struct tm *lt; 132 struct passwd *pw; 133 struct stat sbuf; 134 time_t now; 135 FILE *fp; 136 int fd; 137 size_t mbufsize; 138 char hostname[MAXHOSTNAMELEN], lbuf[256], tmpname[MAXPATHLEN]; 139 const char *whom, *tty; 140 141 snprintf(tmpname, sizeof(tmpname), "%s/wall.XXXXXX", _PATH_TMP); 142 if ((fd = mkstemp(tmpname)) == -1 || (fp = fdopen(fd, "r+")) == NULL) 143 err(1, "can't open temporary file"); 144 145 if (unlink(tmpname) == -1) 146 err(1, "unlink failed: %s", tmpname); 147 148 if ((whom = getlogin()) == NULL) 149 whom = (pw = getpwuid(getuid())) ? pw->pw_name : "???"; 150 gethostname(hostname, sizeof(hostname)); 151 152 time(&now); 153 lt = localtime(&now); 154 155 /* 156 * all this stuff is to blank out a square for the message; 157 * we wrap message lines at column 79, not 80, because some 158 * terminals wrap after 79, some do not, and we can't tell. 159 * Which means that we may leave a non-blank character 160 * in column 80, but that can't be helped. 161 */ 162 fprintf(fp, "Remote Broadcast Message from %s@%s\n", whom, hostname); 163 tty = ttyname(STDERR_FILENO); 164 if (tty == NULL) 165 tty = "notty"; 166 fprintf(fp, " (%s) at %d:%02d ...\n", tty, 167 lt->tm_hour, lt->tm_min); 168 169 putc('\n', fp); 170 171 if (fname && !(freopen(fname, "r", stdin))) 172 err(1, "can't read %s", fname); 173 while (fgets(lbuf, sizeof(lbuf), stdin)) 174 fputs(lbuf, fp); 175 rewind(fp); 176 177 if (fstat(fd, &sbuf)) 178 err(1, "can't stat temporary file"); 179 mbufsize = (size_t)sbuf.st_size; 180 if ((mbuf = malloc(mbufsize)) == NULL) 181 err(1, "malloc failed"); 182 if (fread(mbuf, sizeof(*mbuf), mbufsize, fp) != (u_int)mbufsize) 183 err(1, "can't read temporary file"); 184 if (close(fd)) 185 warn("close failed"); 186 } 187