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 33 #ifndef lint 34 static const char copyright[] = 35 "@(#) Copyright (c) 1988, 1990, 1993\n\ 36 The Regents of the University of California. All rights reserved.\n"; 37 #endif 38 39 #ifndef lint 40 static const char sccsid[] = "@(#)wall.c 8.2 (Berkeley) 11/16/93"; 41 #endif 42 43 /* 44 * This program is not related to David Wall, whose Stanford Ph.D. thesis 45 * is entitled "Mechanisms for Broadcast and Selective Broadcast". 46 */ 47 48 #include <sys/param.h> 49 #include <sys/stat.h> 50 #include <sys/uio.h> 51 52 #include <ctype.h> 53 #include <err.h> 54 #include <grp.h> 55 #include <locale.h> 56 #include <paths.h> 57 #include <pwd.h> 58 #include <stdio.h> 59 #include <stdlib.h> 60 #include <string.h> 61 #include <time.h> 62 #include <unistd.h> 63 #include <utmpx.h> 64 #include <wchar.h> 65 #include <wctype.h> 66 67 #include "ttymsg.h" 68 69 static void makemsg(char *); 70 static void usage(void) __dead2; 71 72 static struct wallgroup { 73 struct wallgroup *next; 74 char *name; 75 gid_t gid; 76 } *grouplist; 77 static int nobanner; 78 static int mbufsize; 79 static char *mbuf; 80 81 static int 82 ttystat(char *line) 83 { 84 struct stat sb; 85 char ttybuf[MAXPATHLEN]; 86 87 (void)snprintf(ttybuf, sizeof(ttybuf), "%s%s", _PATH_DEV, line); 88 if (stat(ttybuf, &sb) == 0) { 89 return (0); 90 } else 91 return (-1); 92 } 93 94 int 95 main(int argc, char *argv[]) 96 { 97 struct iovec iov; 98 struct utmpx *utmp; 99 int ch; 100 int ingroup; 101 struct wallgroup *g; 102 struct group *grp; 103 char **np; 104 const char *p; 105 struct passwd *pw; 106 107 (void)setlocale(LC_CTYPE, ""); 108 109 while ((ch = getopt(argc, argv, "g:n")) != -1) 110 switch (ch) { 111 case 'n': 112 /* undoc option for shutdown: suppress banner */ 113 if (geteuid() == 0) 114 nobanner = 1; 115 break; 116 case 'g': 117 g = (struct wallgroup *)malloc(sizeof *g); 118 g->next = grouplist; 119 g->name = optarg; 120 g->gid = -1; 121 grouplist = g; 122 break; 123 case '?': 124 default: 125 usage(); 126 } 127 argc -= optind; 128 argv += optind; 129 if (argc > 1) 130 usage(); 131 132 for (g = grouplist; g; g = g->next) { 133 grp = getgrnam(g->name); 134 if (grp != NULL) 135 g->gid = grp->gr_gid; 136 else 137 warnx("%s: no such group", g->name); 138 } 139 140 makemsg(*argv); 141 142 iov.iov_base = mbuf; 143 iov.iov_len = mbufsize; 144 /* NOSTRICT */ 145 while ((utmp = getutxent()) != NULL) { 146 if (utmp->ut_type != USER_PROCESS) 147 continue; 148 if (ttystat(utmp->ut_line) != 0) 149 continue; 150 if (grouplist) { 151 ingroup = 0; 152 pw = getpwnam(utmp->ut_user); 153 if (!pw) 154 continue; 155 for (g = grouplist; g && ingroup == 0; g = g->next) { 156 if (g->gid == (gid_t)-1) 157 continue; 158 if (g->gid == pw->pw_gid) 159 ingroup = 1; 160 else if ((grp = getgrgid(g->gid)) != NULL) { 161 for (np = grp->gr_mem; *np; np++) { 162 if (strcmp(*np, utmp->ut_user) == 0) { 163 ingroup = 1; 164 break; 165 } 166 } 167 } 168 } 169 if (ingroup == 0) 170 continue; 171 } 172 if ((p = ttymsg(&iov, 1, utmp->ut_line, 60*5)) != NULL) 173 warnx("%s", p); 174 } 175 exit(0); 176 } 177 178 static void 179 usage(void) 180 { 181 (void)fprintf(stderr, "usage: wall [-g group] [file]\n"); 182 exit(1); 183 } 184 185 void 186 makemsg(char *fname) 187 { 188 int cnt; 189 wchar_t ch; 190 struct tm *lt; 191 struct passwd *pw; 192 struct stat sbuf; 193 time_t now; 194 FILE *fp; 195 int fd; 196 char hostname[MAXHOSTNAMELEN], tmpname[64]; 197 wchar_t *p, *tmp, lbuf[256], codebuf[13]; 198 const char *tty; 199 const char *whom; 200 gid_t egid; 201 202 (void)snprintf(tmpname, sizeof(tmpname), "%s/wall.XXXXXX", _PATH_TMP); 203 if ((fd = mkstemp(tmpname)) == -1 || !(fp = fdopen(fd, "r+"))) 204 err(1, "can't open temporary file"); 205 (void)unlink(tmpname); 206 207 if (!nobanner) { 208 tty = ttyname(STDERR_FILENO); 209 if (tty == NULL) 210 tty = "no tty"; 211 212 if (!(whom = getlogin())) 213 whom = (pw = getpwuid(getuid())) ? pw->pw_name : "???"; 214 (void)gethostname(hostname, sizeof(hostname)); 215 (void)time(&now); 216 lt = localtime(&now); 217 218 /* 219 * all this stuff is to blank out a square for the message; 220 * we wrap message lines at column 79, not 80, because some 221 * terminals wrap after 79, some do not, and we can't tell. 222 * Which means that we may leave a non-blank character 223 * in column 80, but that can't be helped. 224 */ 225 (void)fwprintf(fp, L"\r%79s\r\n", " "); 226 (void)swprintf(lbuf, sizeof(lbuf)/sizeof(wchar_t), 227 L"Broadcast Message from %s@%s", 228 whom, hostname); 229 (void)fwprintf(fp, L"%-79.79S\007\007\r\n", lbuf); 230 (void)swprintf(lbuf, sizeof(lbuf)/sizeof(wchar_t), 231 L" (%s) at %d:%02d %s...", tty, 232 lt->tm_hour, lt->tm_min, lt->tm_zone); 233 (void)fwprintf(fp, L"%-79.79S\r\n", lbuf); 234 } 235 (void)fwprintf(fp, L"%79s\r\n", " "); 236 237 if (fname) { 238 egid = getegid(); 239 setegid(getgid()); 240 if (freopen(fname, "r", stdin) == NULL) 241 err(1, "can't read %s", fname); 242 if (setegid(egid) != 0) 243 err(1, "setegid failed"); 244 } 245 cnt = 0; 246 while (fgetws(lbuf, sizeof(lbuf)/sizeof(wchar_t), stdin)) { 247 for (p = lbuf; (ch = *p) != L'\0'; ++p, ++cnt) { 248 if (ch == L'\r') { 249 putwc(L'\r', fp); 250 cnt = 0; 251 continue; 252 } else if (ch == L'\n') { 253 for (; cnt < 79; ++cnt) 254 putwc(L' ', fp); 255 putwc(L'\r', fp); 256 putwc(L'\n', fp); 257 break; 258 } 259 if (cnt == 79) { 260 putwc(L'\r', fp); 261 putwc(L'\n', fp); 262 cnt = 0; 263 } 264 if (iswprint(ch) || iswspace(ch) || ch == L'\a' || ch == L'\b') { 265 putwc(ch, fp); 266 } else { 267 (void)swprintf(codebuf, sizeof(codebuf)/sizeof(wchar_t), L"<0x%X>", ch); 268 for (tmp = codebuf; *tmp != L'\0'; ++tmp) { 269 putwc(*tmp, fp); 270 if (++cnt == 79) { 271 putwc(L'\r', fp); 272 putwc(L'\n', fp); 273 cnt = 0; 274 } 275 } 276 --cnt; 277 } 278 } 279 } 280 (void)fwprintf(fp, L"%79s\r\n", " "); 281 rewind(fp); 282 283 if (fstat(fd, &sbuf)) 284 err(1, "can't stat temporary file"); 285 mbufsize = sbuf.st_size; 286 if (!(mbuf = malloc((u_int)mbufsize))) 287 err(1, "out of memory"); 288 if ((int)fread(mbuf, sizeof(*mbuf), mbufsize, fp) != mbufsize) 289 err(1, "can't read temporary file"); 290 fclose(fp); 291 } 292