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 static const char sccsid[] = "from: @(#)wall.c 5.14 (Berkeley) 3/2/91"; 43 #endif 44 45 #include <sys/cdefs.h> 46 __FBSDID("$FreeBSD$"); 47 48 /* 49 * This program is not related to David Wall, whose Stanford Ph.D. thesis 50 * is entitled "Mechanisms for Broadcast and Selective Broadcast". 51 */ 52 53 #include <sys/param.h> 54 #include <sys/stat.h> 55 #include <sys/uio.h> 56 #include <rpc/rpc.h> 57 #include <rpcsvc/rwall.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 <time.h> 65 #include <unistd.h> 66 67 static char *mbuf; 68 69 static char notty[] = "no tty"; 70 71 static void makemsg(const char *); 72 static void usage(void); 73 74 /* ARGSUSED */ 75 int 76 main(int argc, char *argv[]) 77 { 78 char *wallhost, res; 79 CLIENT *cl; 80 struct timeval tv; 81 82 if ((argc < 2) || (argc > 3)) 83 usage(); 84 85 wallhost = argv[1]; 86 87 makemsg(argv[2]); 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 errx(1, "%s", clnt_spcreateerror(wallhost)); 101 } 102 103 tv.tv_sec = 15; /* XXX ?? */ 104 tv.tv_usec = 0; 105 if (clnt_call(cl, WALLPROC_WALL, (xdrproc_t)xdr_wrapstring, &mbuf, 106 (xdrproc_t)xdr_void, &res, tv) != RPC_SUCCESS) { 107 /* 108 * An error occurred while calling the server. 109 * Print error message and die. 110 */ 111 errx(1, "%s", clnt_sperror(cl, wallhost)); 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 *tty, hostname[MAXHOSTNAMELEN], lbuf[256], tmpname[64]; 135 const char *whom; 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 unlink(tmpname); 141 142 whom = getlogin(); 143 if (!whom) { 144 pw = getpwuid(getuid()); 145 whom = pw ? pw->pw_name : "???"; 146 } 147 gethostname(hostname, sizeof(hostname)); 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", 159 whom, hostname); 160 tty = ttyname(STDERR_FILENO); 161 if (tty == NULL) 162 tty = notty; 163 fprintf(fp, " (%s) at %d:%02d ...\n", tty, 164 lt->tm_hour, lt->tm_min); 165 166 putc('\n', fp); 167 168 if (fname && !(freopen(fname, "r", stdin))) 169 err(1, "can't read %s", fname); 170 while (fgets(lbuf, sizeof(lbuf), stdin)) 171 fputs(lbuf, fp); 172 rewind(fp); 173 174 if (fstat(fd, &sbuf)) 175 err(1, "can't stat temporary file"); 176 mbufsize = (size_t)sbuf.st_size; 177 mbuf = malloc(mbufsize); 178 if (mbuf == NULL) 179 err(1, "out of memory"); 180 if (fread(mbuf, sizeof(*mbuf), mbufsize, fp) != (u_int)mbufsize) 181 err(1, "can't read temporary file"); 182 close(fd); 183 } 184