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 #include <sys/cdefs.h> 35 36 __FBSDID("$FreeBSD$"); 37 38 #ifndef lint 39 static const char copyright[] = 40 "@(#) Copyright (c) 1988, 1990, 1993\n\ 41 The Regents of the University of California. All rights reserved.\n"; 42 #endif 43 44 #ifndef lint 45 static const char sccsid[] = "@(#)wall.c 8.2 (Berkeley) 11/16/93"; 46 #endif 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 <grp.h> 60 #include <locale.h> 61 #include <paths.h> 62 #include <pwd.h> 63 #include <stdio.h> 64 #include <stdlib.h> 65 #include <string.h> 66 #include <time.h> 67 #define _ULOG_POSIX_NAMES 68 #include <ulog.h> 69 #include <unistd.h> 70 71 #include "ttymsg.h" 72 73 static void makemsg(char *); 74 static void usage(void); 75 76 struct wallgroup { 77 struct wallgroup *next; 78 char *name; 79 gid_t gid; 80 } *grouplist; 81 int nobanner; 82 int mbufsize; 83 char *mbuf; 84 85 static int 86 ttystat(char *line) 87 { 88 struct stat sb; 89 char ttybuf[MAXPATHLEN]; 90 91 (void)snprintf(ttybuf, sizeof(ttybuf), "%s%s", _PATH_DEV, line); 92 if (stat(ttybuf, &sb) == 0) { 93 return (0); 94 } else 95 return (-1); 96 } 97 98 int 99 main(int argc, char *argv[]) 100 { 101 struct iovec iov; 102 struct utmpx *utmp; 103 int ch; 104 int ingroup; 105 struct wallgroup *g; 106 struct group *grp; 107 char **np; 108 const char *p; 109 struct passwd *pw; 110 111 (void)setlocale(LC_CTYPE, ""); 112 113 while ((ch = getopt(argc, argv, "g:n")) != -1) 114 switch (ch) { 115 case 'n': 116 /* undoc option for shutdown: suppress banner */ 117 if (geteuid() == 0) 118 nobanner = 1; 119 break; 120 case 'g': 121 g = (struct wallgroup *)malloc(sizeof *g); 122 g->next = grouplist; 123 g->name = optarg; 124 g->gid = -1; 125 grouplist = g; 126 break; 127 case '?': 128 default: 129 usage(); 130 } 131 argc -= optind; 132 argv += optind; 133 if (argc > 1) 134 usage(); 135 136 for (g = grouplist; g; g = g->next) { 137 grp = getgrnam(g->name); 138 if (grp != NULL) 139 g->gid = grp->gr_gid; 140 else 141 warnx("%s: no such group", g->name); 142 } 143 144 makemsg(*argv); 145 146 iov.iov_base = mbuf; 147 iov.iov_len = mbufsize; 148 /* NOSTRICT */ 149 while ((utmp = getutxent()) != NULL) { 150 if (utmp->ut_type != USER_PROCESS) 151 continue; 152 if (ttystat(utmp->ut_line) != 0) 153 continue; 154 if (grouplist) { 155 ingroup = 0; 156 pw = getpwnam(utmp->ut_user); 157 if (!pw) 158 continue; 159 for (g = grouplist; g && ingroup == 0; g = g->next) { 160 if (g->gid == (gid_t)-1) 161 continue; 162 if (g->gid == pw->pw_gid) 163 ingroup = 1; 164 else if ((grp = getgrgid(g->gid)) != NULL) { 165 for (np = grp->gr_mem; *np; np++) { 166 if (strcmp(*np, utmp->ut_user) == 0) { 167 ingroup = 1; 168 break; 169 } 170 } 171 } 172 } 173 if (ingroup == 0) 174 continue; 175 } 176 if ((p = ttymsg(&iov, 1, utmp->ut_line, 60*5)) != NULL) 177 warnx("%s", p); 178 } 179 exit(0); 180 } 181 182 static void 183 usage() 184 { 185 (void)fprintf(stderr, "usage: wall [-g group] [file]\n"); 186 exit(1); 187 } 188 189 void 190 makemsg(char *fname) 191 { 192 int cnt; 193 unsigned char ch; 194 struct tm *lt; 195 struct passwd *pw; 196 struct stat sbuf; 197 time_t now; 198 FILE *fp; 199 int fd; 200 char *p, hostname[MAXHOSTNAMELEN], lbuf[256], tmpname[64]; 201 const char *tty; 202 const char *whom; 203 gid_t egid; 204 205 (void)snprintf(tmpname, sizeof(tmpname), "%s/wall.XXXXXX", _PATH_TMP); 206 if ((fd = mkstemp(tmpname)) == -1 || !(fp = fdopen(fd, "r+"))) 207 err(1, "can't open temporary file"); 208 (void)unlink(tmpname); 209 210 if (!nobanner) { 211 tty = ttyname(STDERR_FILENO); 212 if (tty == NULL) 213 tty = "no tty"; 214 215 if (!(whom = getlogin())) 216 whom = (pw = getpwuid(getuid())) ? pw->pw_name : "???"; 217 (void)gethostname(hostname, sizeof(hostname)); 218 (void)time(&now); 219 lt = localtime(&now); 220 221 /* 222 * all this stuff is to blank out a square for the message; 223 * we wrap message lines at column 79, not 80, because some 224 * terminals wrap after 79, some do not, and we can't tell. 225 * Which means that we may leave a non-blank character 226 * in column 80, but that can't be helped. 227 */ 228 (void)fprintf(fp, "\r%79s\r\n", " "); 229 (void)snprintf(lbuf, sizeof(lbuf), 230 "Broadcast Message from %s@%s", 231 whom, hostname); 232 (void)fprintf(fp, "%-79.79s\007\007\r\n", lbuf); 233 (void)snprintf(lbuf, sizeof(lbuf), 234 " (%s) at %d:%02d %s...", tty, 235 lt->tm_hour, lt->tm_min, lt->tm_zone); 236 (void)fprintf(fp, "%-79.79s\r\n", lbuf); 237 } 238 (void)fprintf(fp, "%79s\r\n", " "); 239 240 if (fname) { 241 egid = getegid(); 242 setegid(getgid()); 243 if (freopen(fname, "r", stdin) == NULL) 244 err(1, "can't read %s", fname); 245 setegid(egid); 246 } 247 while (fgets(lbuf, sizeof(lbuf), stdin)) { 248 for (cnt = 0, p = lbuf; (ch = *p) != '\0'; ++p, ++cnt) { 249 if (ch == '\r') { 250 putc('\r', fp); 251 cnt = 0; 252 continue; 253 } else if (ch == '\n') { 254 for (; cnt < 79; ++cnt) 255 putc(' ', fp); 256 putc('\r', fp); 257 putc('\n', fp); 258 break; 259 } 260 if (cnt == 79) { 261 putc('\r', fp); 262 putc('\n', fp); 263 cnt = 0; 264 } 265 if (((ch & 0x80) && ch < 0xA0) || 266 /* disable upper controls */ 267 (!isprint(ch) && !isspace(ch) && 268 ch != '\a' && ch != '\b') 269 ) { 270 if (ch & 0x80) { 271 ch &= 0x7F; 272 putc('M', fp); 273 if (++cnt == 79) { 274 putc('\r', fp); 275 putc('\n', fp); 276 cnt = 0; 277 } 278 putc('-', fp); 279 if (++cnt == 79) { 280 putc('\r', fp); 281 putc('\n', fp); 282 cnt = 0; 283 } 284 } 285 if (iscntrl(ch)) { 286 ch ^= 040; 287 putc('^', fp); 288 if (++cnt == 79) { 289 putc('\r', fp); 290 putc('\n', fp); 291 cnt = 0; 292 } 293 } 294 } 295 putc(ch, fp); 296 } 297 } 298 (void)fprintf(fp, "%79s\r\n", " "); 299 rewind(fp); 300 301 if (fstat(fd, &sbuf)) 302 err(1, "can't stat temporary file"); 303 mbufsize = sbuf.st_size; 304 if (!(mbuf = malloc((u_int)mbufsize))) 305 err(1, "out of memory"); 306 if ((int)fread(mbuf, sizeof(*mbuf), mbufsize, fp) != mbufsize) 307 err(1, "can't read temporary file"); 308 (void)close(fd); 309 } 310