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. Neither the name of the University nor the names of its contributors 15 * may be used to endorse or promote products derived from this software 16 * without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 * 30 * @(#) Copyright (c) 1988 Regents of the University of California. All rights reserved. 31 * @(#)wall.c 5.14 (Berkeley) 3/2/91 32 * $FreeBSD: src/usr.bin/rwall/rwall.c,v 1.14 2005/05/21 09:55:08 ru Exp $ 33 * $DragonFly: src/usr.bin/rwall/rwall.c,v 1.7 2005/07/30 16:44:12 liamfoy Exp $ 34 */ 35 36 /* 37 * This program is not related to David Wall, whose Stanford Ph.D. thesis 38 * is entitled "Mechanisms for Broadcast and Selective Broadcast". 39 */ 40 41 #include <sys/types.h> 42 #include <sys/param.h> 43 #include <sys/stat.h> 44 45 #include <err.h> 46 #include <paths.h> 47 #include <pwd.h> 48 #include <stdio.h> 49 #include <stdlib.h> 50 #include <time.h> 51 #include <unistd.h> 52 53 #include <rpc/rpc.h> 54 #include <rpcsvc/rwall.h> 55 56 static char *mbuf; 57 58 static void makemsg(const char *); 59 static void usage(void); 60 61 int 62 main(int argc, char **argv) 63 { 64 const char *wallhost; 65 char *res; 66 CLIENT *cl; 67 struct timeval tv; 68 int c; 69 70 while ((c = getopt(argc, argv, "")) != -1) { 71 switch (c) { 72 default: 73 usage(); 74 } 75 } 76 77 argc -= optind; 78 argv += optind; 79 80 if (argc < 1 || argc > 2) 81 usage(); 82 83 wallhost = argv[0]; 84 85 /* 86 * Create client "handle" used for calling MESSAGEPROG on the 87 * server designated on the command line. We tell the rpc package 88 * to use the "tcp" protocol when contacting the server. 89 */ 90 cl = clnt_create(wallhost, WALLPROG, WALLVERS, "udp"); 91 if (cl == NULL) { 92 /* 93 * Couldn't establish connection with server. 94 * Print error message and die. 95 */ 96 clnt_pcreateerror(wallhost); 97 exit(1); 98 } 99 100 makemsg(argv[1]); 101 102 tv.tv_sec = 15; /* XXX ?? */ 103 tv.tv_usec = 0; 104 if (clnt_call(cl, WALLPROC_WALL, (xdrproc_t)xdr_wrapstring, &mbuf, 105 (xdrproc_t)xdr_void, &res, tv) != RPC_SUCCESS) { 106 /* 107 * An error occurred while calling the server. 108 * Print error message and die. 109 */ 110 clnt_perror(cl, wallhost); 111 exit(1); 112 } 113 114 return(0); 115 } 116 117 static void 118 usage(void) 119 { 120 fprintf(stderr, "usage: rwall host [file]\n"); 121 exit(1); 122 } 123 124 static void 125 makemsg(const char *fname) 126 { 127 struct tm *lt; 128 struct passwd *pw; 129 struct stat sbuf; 130 time_t now; 131 FILE *fp; 132 int fd; 133 size_t mbufsize; 134 char hostname[MAXHOSTNAMELEN], lbuf[256], tmpname[MAXPATHLEN]; 135 const char *whom, *tty; 136 137 snprintf(tmpname, sizeof(tmpname), "%s/wall.XXXXXX", _PATH_TMP); 138 if ((fd = mkstemp(tmpname)) == -1 || (fp = fdopen(fd, "r+")) == NULL) 139 err(1, "can't open temporary file"); 140 141 if (unlink(tmpname) == -1) 142 err(1, "unlink failed: %s", tmpname); 143 144 if ((whom = getlogin()) == NULL) 145 whom = (pw = getpwuid(getuid())) ? pw->pw_name : "???"; 146 gethostname(hostname, sizeof(hostname)); 147 148 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 fprintf(fp, "Remote Broadcast Message from %s@%s\n", whom, hostname); 159 tty = ttyname(STDERR_FILENO); 160 if (tty == NULL) 161 tty = "notty"; 162 fprintf(fp, " (%s) at %d:%02d ...\n", tty, 163 lt->tm_hour, lt->tm_min); 164 165 putc('\n', fp); 166 167 if (fname && !(freopen(fname, "r", stdin))) 168 err(1, "can't read %s", fname); 169 while (fgets(lbuf, sizeof(lbuf), stdin)) 170 fputs(lbuf, fp); 171 rewind(fp); 172 173 if (fstat(fd, &sbuf)) 174 err(1, "can't stat temporary file"); 175 mbufsize = (size_t)sbuf.st_size; 176 if ((mbuf = malloc(mbufsize)) == NULL) 177 err(1, "malloc failed"); 178 if (fread(mbuf, sizeof(*mbuf), mbufsize, fp) != (u_int)mbufsize) 179 err(1, "can't read temporary file"); 180 if (close(fd)) 181 warn("close failed"); 182 } 183