1 /* 2 * Copyright (c) 1988, 1990, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #ifndef lint 35 static const char copyright[] = 36 "@(#) Copyright (c) 1988, 1990, 1993\n\ 37 The Regents of the University of California. All rights reserved.\n"; 38 #endif /* not lint */ 39 40 #ifndef lint 41 #if 0 42 static char sccsid[] = "@(#)wall.c 8.2 (Berkeley) 11/16/93"; 43 #endif 44 static const char rcsid[] = 45 "$FreeBSD$"; 46 #endif /* not lint */ 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 57 #include <ctype.h> 58 #include <err.h> 59 #include <locale.h> 60 #include <paths.h> 61 #include <pwd.h> 62 #include <stdio.h> 63 #include <stdlib.h> 64 #include <string.h> 65 #include <time.h> 66 #include <unistd.h> 67 #include <utmp.h> 68 69 void makemsg __P((char *)); 70 static void usage __P((void)); 71 char *ttymsg __P((struct iovec *, int, char *, int)); 72 73 #define IGNOREUSER "sleeper" 74 75 int nobanner; 76 int mbufsize; 77 char *mbuf; 78 79 /* ARGSUSED */ 80 int 81 main(argc, argv) 82 int argc; 83 char **argv; 84 { 85 int ch; 86 struct iovec iov; 87 struct utmp utmp; 88 FILE *fp; 89 char *p; 90 char line[sizeof(utmp.ut_line) + 1]; 91 92 (void)setlocale(LC_CTYPE, ""); 93 94 while ((ch = getopt(argc, argv, "n")) != -1) 95 switch (ch) { 96 case 'n': 97 /* undoc option for shutdown: suppress banner */ 98 if (geteuid() == 0) 99 nobanner = 1; 100 break; 101 case '?': 102 default: 103 usage(); 104 } 105 argc -= optind; 106 argv += optind; 107 if (argc > 1) 108 usage(); 109 110 makemsg(*argv); 111 112 if (!(fp = fopen(_PATH_UTMP, "r"))) 113 err(1, "cannot read %s", _PATH_UTMP); 114 iov.iov_base = mbuf; 115 iov.iov_len = mbufsize; 116 /* NOSTRICT */ 117 while (fread((char *)&utmp, sizeof(utmp), 1, fp) == 1) { 118 if (!utmp.ut_name[0] || 119 !strncmp(utmp.ut_name, IGNOREUSER, sizeof(utmp.ut_name))) 120 continue; 121 strncpy(line, utmp.ut_line, sizeof(utmp.ut_line)); 122 line[sizeof(utmp.ut_line)] = '\0'; 123 if ((p = ttymsg(&iov, 1, line, 60*5)) != NULL) 124 warnx("%s", p); 125 } 126 exit(0); 127 } 128 129 static void 130 usage() 131 { 132 (void)fprintf(stderr, "usage: wall [file]\n"); 133 exit(1); 134 } 135 136 void 137 makemsg(fname) 138 char *fname; 139 { 140 register int cnt; 141 register unsigned char ch; 142 struct tm *lt; 143 struct passwd *pw; 144 struct stat sbuf; 145 time_t now; 146 FILE *fp; 147 int fd; 148 char *p, *tty, hostname[MAXHOSTNAMELEN], lbuf[256], tmpname[64]; 149 const char *whom; 150 151 (void)snprintf(tmpname, sizeof(tmpname), "%s/wall.XXXXXX", _PATH_TMP); 152 if ((fd = mkstemp(tmpname)) == -1 || !(fp = fdopen(fd, "r+"))) 153 err(1, "can't open temporary file"); 154 (void)unlink(tmpname); 155 156 if (!nobanner) { 157 tty = ttyname(STDERR_FILENO); 158 if (tty == NULL) 159 tty = "no tty"; 160 161 if (!(whom = getlogin())) 162 whom = (pw = getpwuid(getuid())) ? pw->pw_name : "???"; 163 (void)gethostname(hostname, sizeof(hostname)); 164 (void)time(&now); 165 lt = localtime(&now); 166 167 /* 168 * all this stuff is to blank out a square for the message; 169 * we wrap message lines at column 79, not 80, because some 170 * terminals wrap after 79, some do not, and we can't tell. 171 * Which means that we may leave a non-blank character 172 * in column 80, but that can't be helped. 173 */ 174 (void)fprintf(fp, "\r%79s\r\n", " "); 175 (void)snprintf(lbuf, sizeof(lbuf), 176 "Broadcast Message from %s@%s", 177 whom, hostname); 178 (void)fprintf(fp, "%-79.79s\007\007\r\n", lbuf); 179 (void)snprintf(lbuf, sizeof(lbuf), 180 " (%s) at %d:%02d %s...", tty, 181 lt->tm_hour, lt->tm_min, lt->tm_zone); 182 (void)fprintf(fp, "%-79.79s\r\n", lbuf); 183 } 184 (void)fprintf(fp, "%79s\r\n", " "); 185 186 if (fname && !(freopen(fname, "r", stdin))) 187 err(1, "can't read %s", fname); 188 while (fgets(lbuf, sizeof(lbuf), stdin)) 189 for (cnt = 0, p = lbuf; (ch = *p) != '\0'; ++p, ++cnt) { 190 if (ch == '\r') { 191 cnt = 0; 192 } else if (cnt == 79 || ch == '\n') { 193 for (; cnt < 79; ++cnt) 194 putc(' ', fp); 195 putc('\r', fp); 196 putc('\n', fp); 197 cnt = 0; 198 } else if (((ch & 0x80) && ch < 0xA0) || 199 /* disable upper controls */ 200 (!isprint(ch) && !isspace(ch) && 201 ch != '\a' && ch != '\b') 202 ) { 203 if (ch & 0x80) { 204 ch &= 0x7F; 205 putc('M', fp); 206 if (++cnt == 79) { 207 putc('\r', fp); 208 putc('\n', fp); 209 cnt = 0; 210 } 211 putc('-', fp); 212 if (++cnt == 79) { 213 putc('\r', fp); 214 putc('\n', fp); 215 cnt = 0; 216 } 217 } 218 if (iscntrl(ch)) { 219 ch ^= 040; 220 putc('^', fp); 221 if (++cnt == 79) { 222 putc('\r', fp); 223 putc('\n', fp); 224 cnt = 0; 225 } 226 } 227 putc(ch, fp); 228 } else { 229 putc(ch, fp); 230 } 231 } 232 (void)fprintf(fp, "%79s\r\n", " "); 233 rewind(fp); 234 235 if (fstat(fd, &sbuf)) 236 err(1, "can't stat temporary file"); 237 mbufsize = sbuf.st_size; 238 if (!(mbuf = malloc((u_int)mbufsize))) 239 err(1, "out of memory"); 240 if (fread(mbuf, sizeof(*mbuf), mbufsize, fp) != mbufsize) 241 err(1, "can't read temporary file"); 242 (void)close(fd); 243 } 244