1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1988, 1990, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 34 __FBSDID("$FreeBSD$"); 35 36 #ifndef lint 37 static const char copyright[] = 38 "@(#) Copyright (c) 1988, 1990, 1993\n\ 39 The Regents of the University of California. All rights reserved.\n"; 40 #endif 41 42 #ifndef lint 43 static const char sccsid[] = "@(#)wall.c 8.2 (Berkeley) 11/16/93"; 44 #endif 45 46 /* 47 * This program is not related to David Wall, whose Stanford Ph.D. thesis 48 * is entitled "Mechanisms for Broadcast and Selective Broadcast". 49 */ 50 51 #include <sys/param.h> 52 #include <sys/stat.h> 53 #include <sys/uio.h> 54 55 #include <ctype.h> 56 #include <err.h> 57 #include <grp.h> 58 #include <locale.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 #include <utmpx.h> 67 #include <wchar.h> 68 #include <wctype.h> 69 70 #include "ttymsg.h" 71 72 static void makemsg(char *); 73 static void usage(void); 74 75 static struct wallgroup { 76 struct wallgroup *next; 77 char *name; 78 gid_t gid; 79 } *grouplist; 80 static int nobanner; 81 static int mbufsize; 82 static char *mbuf; 83 84 static int 85 ttystat(char *line) 86 { 87 struct stat sb; 88 char ttybuf[MAXPATHLEN]; 89 90 (void)snprintf(ttybuf, sizeof(ttybuf), "%s%s", _PATH_DEV, line); 91 if (stat(ttybuf, &sb) == 0) { 92 return (0); 93 } else 94 return (-1); 95 } 96 97 int 98 main(int argc, char *argv[]) 99 { 100 struct iovec iov; 101 struct utmpx *utmp; 102 int ch; 103 int ingroup; 104 struct wallgroup *g; 105 struct group *grp; 106 char **np; 107 const char *p; 108 struct passwd *pw; 109 110 (void)setlocale(LC_CTYPE, ""); 111 112 while ((ch = getopt(argc, argv, "g:n")) != -1) 113 switch (ch) { 114 case 'n': 115 /* undoc option for shutdown: suppress banner */ 116 if (geteuid() == 0) 117 nobanner = 1; 118 break; 119 case 'g': 120 g = (struct wallgroup *)malloc(sizeof *g); 121 g->next = grouplist; 122 g->name = optarg; 123 g->gid = -1; 124 grouplist = g; 125 break; 126 case '?': 127 default: 128 usage(); 129 } 130 argc -= optind; 131 argv += optind; 132 if (argc > 1) 133 usage(); 134 135 for (g = grouplist; g; g = g->next) { 136 grp = getgrnam(g->name); 137 if (grp != NULL) 138 g->gid = grp->gr_gid; 139 else 140 warnx("%s: no such group", g->name); 141 } 142 143 makemsg(*argv); 144 145 iov.iov_base = mbuf; 146 iov.iov_len = mbufsize; 147 /* NOSTRICT */ 148 while ((utmp = getutxent()) != NULL) { 149 if (utmp->ut_type != USER_PROCESS) 150 continue; 151 if (ttystat(utmp->ut_line) != 0) 152 continue; 153 if (grouplist) { 154 ingroup = 0; 155 pw = getpwnam(utmp->ut_user); 156 if (!pw) 157 continue; 158 for (g = grouplist; g && ingroup == 0; g = g->next) { 159 if (g->gid == (gid_t)-1) 160 continue; 161 if (g->gid == pw->pw_gid) 162 ingroup = 1; 163 else if ((grp = getgrgid(g->gid)) != NULL) { 164 for (np = grp->gr_mem; *np; np++) { 165 if (strcmp(*np, utmp->ut_user) == 0) { 166 ingroup = 1; 167 break; 168 } 169 } 170 } 171 } 172 if (ingroup == 0) 173 continue; 174 } 175 if ((p = ttymsg(&iov, 1, utmp->ut_line, 60*5)) != NULL) 176 warnx("%s", p); 177 } 178 exit(0); 179 } 180 181 static void 182 usage(void) 183 { 184 (void)fprintf(stderr, "usage: wall [-g group] [file]\n"); 185 exit(1); 186 } 187 188 void 189 makemsg(char *fname) 190 { 191 int cnt; 192 wchar_t ch; 193 struct tm *lt; 194 struct passwd *pw; 195 struct stat sbuf; 196 time_t now; 197 FILE *fp; 198 int fd; 199 char hostname[MAXHOSTNAMELEN], tmpname[64]; 200 wchar_t *p, *tmp, lbuf[256], codebuf[13]; 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)fwprintf(fp, L"\r%79s\r\n", " "); 229 (void)swprintf(lbuf, sizeof(lbuf)/sizeof(wchar_t), 230 L"Broadcast Message from %s@%s", 231 whom, hostname); 232 (void)fwprintf(fp, L"%-79.79S\007\007\r\n", lbuf); 233 (void)swprintf(lbuf, sizeof(lbuf)/sizeof(wchar_t), 234 L" (%s) at %d:%02d %s...", tty, 235 lt->tm_hour, lt->tm_min, lt->tm_zone); 236 (void)fwprintf(fp, L"%-79.79S\r\n", lbuf); 237 } 238 (void)fwprintf(fp, L"%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 if (setegid(egid) != 0) 246 err(1, "setegid failed"); 247 } 248 cnt = 0; 249 while (fgetws(lbuf, sizeof(lbuf)/sizeof(wchar_t), stdin)) { 250 for (p = lbuf; (ch = *p) != L'\0'; ++p, ++cnt) { 251 if (ch == L'\r') { 252 putwc(L'\r', fp); 253 cnt = 0; 254 continue; 255 } else if (ch == L'\n') { 256 for (; cnt < 79; ++cnt) 257 putwc(L' ', fp); 258 putwc(L'\r', fp); 259 putwc(L'\n', fp); 260 break; 261 } 262 if (cnt == 79) { 263 putwc(L'\r', fp); 264 putwc(L'\n', fp); 265 cnt = 0; 266 } 267 if (iswprint(ch) || iswspace(ch) || ch == L'\a' || ch == L'\b') { 268 putwc(ch, fp); 269 } else { 270 (void)swprintf(codebuf, sizeof(codebuf)/sizeof(wchar_t), L"<0x%X>", ch); 271 for (tmp = codebuf; *tmp != L'\0'; ++tmp) { 272 putwc(*tmp, fp); 273 if (++cnt == 79) { 274 putwc(L'\r', fp); 275 putwc(L'\n', fp); 276 cnt = 0; 277 } 278 } 279 --cnt; 280 } 281 } 282 } 283 (void)fwprintf(fp, L"%79s\r\n", " "); 284 rewind(fp); 285 286 if (fstat(fd, &sbuf)) 287 err(1, "can't stat temporary file"); 288 mbufsize = sbuf.st_size; 289 if (!(mbuf = malloc((u_int)mbufsize))) 290 err(1, "out of memory"); 291 if ((int)fread(mbuf, sizeof(*mbuf), mbufsize, fp) != mbufsize) 292 err(1, "can't read temporary file"); 293 fclose(fp); 294 } 295